Dynafit Mercury Ski Boot — First Look

Post by WildSnow.com blogger | December 11, 2012      

Dynafit Mercury backcountry skiing boot, the Vulcan's little bro.

I recently got a pair of production Dynafit Mercury boots for testing this winter. As a more inexpensive cousin of the Dynafit Vulcan, I think it will be quite popular. I’m curious how they will compare to the Vulcan. They feel stiff and of course have an impressive walk mode. You can find my review of the prototype Vulcan here.

The Mercury has a lot in common with the Vulcan. Most of the differences lie in the use of various materials, with a few structural changes as well. The lower shell is composed of Grilamid, similar to the Vulcan. The upper cuff, however, utilizes fiberglass reinforced TPU in the rear, and Pebax in the front. The stiffness of the fiber reinforced TPU is impressive. It feels very close to the rock-solid rigidity of carbon (or so-called carbon, which is many cases is just fiberglass with a black cosmetic exterior or small amount of carbon–not mentioning any names). The stiff rear is riveted to softer Pebax in the front to allow the boot to flex open for entry. The front flaps are significantly less stiff than the ones on the Vulcan. This makes it much easier to get in and out of the boot, something that can be a little painful on the Vulcan (although still much easier than an overlap boot). Another important difference I noticed is the use of stops on the upper shell. Common on many AT boots, these stops engage the lower shell when flexed past a certain point. Once they engage, the boots have a much stiffer flex pattern. While they make a boot stiff, these stops can have the effect of making a boot have a funky, non-progressive flex. They may also reduce the walk mode flex by a few degrees if you have the boot buckled while walking. The question is, how will this affect performance on snow?

Dynafit Mercury backcountry ski boots

I measured the flex range as 47 degrees in walk mode (shell only). This of course is reduced in real life when a liner and foot are inserted. How much depends on what type of liner you're using. It's probably safe to say you'll never max out the rear-ward movement.

Dynafit Mercury backcountry ski boots

Interior of the Mercuries, showing the inner "rear tongue", and the stops.

Dynafit Vulcan backcountry ski boots interior

In contrast, here is the interior of the Vulcan from a different angle. No stops.

Dynafit Mercury backcountry ski boots liner.

The liner looks nice as well, and features a grippy sole. I still prefer my trusty, toasty Intuitions.

Dynafit Mercury backcountry ski boots liner.

The liner also features some nice durable patches to prevent wear in vulnerable spots.

Dynafit Mercury backcountry ski boots sole.

The sole appears to be the same used on my prototype Vulcan. Interestingly, the hard plastic lugs are gone. They are replaced by slightly less hard TPU lugs (the grey cylinders). The original lugs improved performance in non-tech bindings but were rumored to have some patent-infringing issues. These appear to serve the same function although they feel slightly softer.

I’ve gotten out on the Mercurys once, but alas, all I could find was fluffy powder, not exactly conducive to rigorous boot testing. I tried to make up for it by jumping off everything in sight. After more extensive testing, I’ll put up a detailed review. I’m also intrigued to see how they compare to the production Vulcans.

Shell (with tongue): 1300 grams
Liner: 330 grams


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82 Responses to “Dynafit Mercury Ski Boot — First Look”

  1. Lisa December 11th, 2012 9:46 am

    Nice first look, Louie! Hoji tells his boot story on this cool vid.


    Looking forward to skiing Canadian cold smoke with you soon!

  2. Crazy Horse December 11th, 2012 10:41 am

    There is a boot that deserves to be on the radar in the herd of sidecountry boots on the shelves this year. Full Tilts are as much as 2# lighter than overlap alpine boots. The upper is not riveted at the back so should have a reasonable walk mode with buckles loosened. Easily changed forward flex characteristics, and powerful enough to have been the boot of choice for world cup downhillers back in the day. No tech fittings, but removable walk mode soles. Intuition liners standard. Looks like the manufacturer could add tech fittings to the design if their arm was properly twisted. (that is your dept, LOU!)

  3. XXX_er December 11th, 2012 11:14 am

    how did you do with the fit louie, I went with my normal 24 shell size, lots of toe room but the stock liner would not work due to pressure over the instep/ that bone on top of the foot, but I put some old heat molded liners in and they ski amazing, .best fit I have ever had … plenty stiff for the ski hill /enough ROM for the skin track, I can even drive a 5spd wearing them even more ROM without the tongues ( note they are marked left & right) the power strap will fall off pretty quick you can add some washers to the screws but I may just be ditching it, the one buckle lock-n-load I like a LOT, there is a good solid boot to cuff interface, no cuff cant didnt seem to bother me, very light

    SO a great shell liner but the doesn’t work (and its not just me) SO … do yourself a favor & buy the new liners at the same time

    I would call the Mercury a generational leap over my 6 yr old 4 buckle “freeride” AT boot

  4. Nick December 11th, 2012 12:22 pm

    I am excited to try these on this year, as well as the One and the TLT5s. I am afraid the TLT5s will be a little too soft for my tastes, but the One or the Mercury will fit the bill nicely. The Vulcan is too stiff IMO for my skiing style.

  5. Mike December 11th, 2012 12:50 pm

    Is the only difference between the ONE and the Mercury the tongue (removable on the Mercury)?

  6. Louie Dawson December 11th, 2012 3:48 pm

    I ended up using an intuition liner I had that was already molded to my feet. I love intuitions, all other liners I’ve tried pack out way to much, so I just stick with what works for me. Don’t you wish boot companies sold shells separately?

    Although I haven’t skied the ONE, and don’t have one with me here, I know they are significantly different. The construction is different (like the removable toungue), but also the materials. The ONE is entirely Pebax, while the Mercury features Grilamid (basically Nylon), and fiberglass reinforced TPU. The Fiber reinforced TPU is much stiffer than Pebax, while the Grilamid is stiff as well, while being lighter than Pebax.

  7. XXX_er December 11th, 2012 5:56 pm

    ” Don’t you wish boot companies sold shells separately”

    No kidding! I have brand new 5 – 10 yr old scarpa and garmont liners kicking around after replacing them with intuition, I guess if I ever sell the boots I can l sell them with original liners

    This time it isn’t all bad cuz by some twist of fate the dynafit liners feel like they will work very well in my alpine shells, IMO the Dynafit liner are a high volume liner, I could barely get my foot in the stock liner inside the mercury shell but change the liner and presto … great boot

    I think I am going to lose the power straps

  8. Charlie December 11th, 2012 6:14 pm

    The ONE is plenty stiff for me; any stiffer and I think it would overpower my stiffest ski (an El Hombre). When desired, I’ve been loosening the power strap to get a softer/smoother flex.

  9. Lee Lau December 11th, 2012 9:54 pm

    The stock dynafit liner isn’t that bad Louie. It’s better than the old ones. You do need to get it molded though. Having said that its 340g and a Protour or Luxury Intution liner is 220g.

  10. Chris Simmons December 12th, 2012 10:34 am

    Louie, what model of Intuition liner are you rocking? What about Lou?

  11. Lou December 12th, 2012 11:12 am

    Chris, I tend to use the Intuition Pro Tour. I’m a wimp and like the comfy foam. It’s not as dense as some other liners and definitly detracts from the downhill power of the boot, but I’m totally adjusted to it. In the same way, I don’t use the optional tongues in my TLT5s. I just ski mellow and enjoy myself. I do enjoy watching powerful skiers use stronger boots, however, so I see the point.

  12. Rob December 12th, 2012 11:41 am

    Bunch of days in this boot so far both on lifts and touring. Continue to be amazed by it’s performance for it’s weight. Have gone back and forward about tongue in or out, maybe keeping the adjustabilty is best option. Absolutely the best boot AT or Alpine I’ve ever had on my feet.

    I do wonder how durable it will prove..

  13. Dan December 12th, 2012 1:21 pm

    Louie, the tongue area of the ONE looks just like the TLT5 w/o the removable tongue installed. It has the little knob that helps to hold the removable tongue but no slot like in the TLT5. Do you know whether or not the tongue used in the Mercury could be fitted to the ONE?

  14. Andy December 12th, 2012 4:55 pm

    Dan: it cannot. No slot. Maybe some kind of home brew mod could work.

  15. Dan December 12th, 2012 4:58 pm

    Andy: Thanks. I did not think the tongue would readily fit, but had to ask…hope springs eternal.

  16. Paulus December 13th, 2012 1:10 pm

    What i want to know is if the Mercury is noticeably stiffer without the tongue, than the One, and what boot has the nicest flex?

  17. Chris Simmons December 14th, 2012 8:04 am

    @ Lou. Thanks! I’m still interested in hearing what Louie’s using too – I think it would be an interesting generational comparison.

    @ Dan – is a little more complicated than just the groove. Its also missing the plate-piece that the groove exists in. The three rivets are there for it, which implies to me that Dynafit used the same mold to make the One as for the Mercury. Still, the one is missing the key piece necessary to add a tongue after market.

    @ Paulus – I tried on the One and the Mercury before choosing the Mercury. The difference in tour mode was imperceptible for me. Adding the tongue in tour mode was still an improvement over the tour mode of my current boots (a pair of BD Quadrants). The Mercury seemed noticeably stiffer without the tongue than the One, but I don’t know if that was my warped perception (because by then I had already decided on the Mercury and I had been wearing both boots for +30 minutes) or if its reality.

    In the end, I settled on the Mercury because I could remove the tongues for days that are all about the tour, and leave it in for days that are about the turn.

  18. Chuck December 14th, 2012 12:52 pm

    Best binding for this new line of Dynafit Boots? Vertical FT or Radical FT? For 50% IN and 50% OUT of bounds.

  19. Skyler Holman December 15th, 2012 3:06 pm

    I’d like to know how much difference people are feeling between the flex and stiffness of this boot vs the vulcan.

  20. Lee Lau December 15th, 2012 6:21 pm


    The Mercury’s gotta be a good 10- 15% less stiff than the proto Vulcans. And the production Vulcan is stiffer than my protos. No productions yet to offer an opinion. That percentage number is a subjective WAG

  21. Zeb December 17th, 2012 7:04 am

    I just used the Mercuries on lift serviced, Northeastern ice and wind blown. Huge improvment from Mega-Rides. I noticed one thing about the tongue that I haven’t seen mentioned: its use changes the fit of the boot a bit. With the tongue inserted, the presure of the mid-buckle was more dispersed, which was way more comfortable for my feet.

  22. Suizo December 18th, 2012 10:24 pm

    Question: Which buckles do you need to open and unhinge completely to install the tongue.
    Is it possible to do so when you just open the buckles but without to unhinge them?

  23. Zeb December 19th, 2012 7:48 am

    @Suizo: you just need to release the buckle; you don’t need to disconnect the bail from the buckle. It’s also a lot easier to put the boots on with the tongue out.

  24. Vincent December 20th, 2012 2:53 pm

    Any opinion on Mercury vs. One vs. TLT5 Performance? I currently have a Titan UL as touring boot, but I think there are better walking boots for longer tours (weight is not the main issue, walk mode on and off the skis is). Tlt5 P would be logical to keep beside the Titan UL, but I’m someone who skis quite in front of his boots and I’m scared that it might not give enough support. What’s the difference between Mercury and One? Is the main cause of the weight difference the tongue? Is the Mercury without the tongue, the One?

  25. Lou Dawson December 20th, 2012 3:51 pm

    I’ll hit on first question. Mercury is easily stiffer but has nearly as good a walk mode as the TLT5, other than the walking comfort the small amount of metatarsal flex gives you with TLT5 (more psychological than anything else.)

    Louie or Lee can answer the other, if they’re so inclined.

  26. Lee Lau December 20th, 2012 4:00 pm

    Vincent if you’ve already got the Titan UL you might as well keep it and get the TLT5. It isn’t the most durable boot in the world but if you’re not skiing a lot on it and saving it just for pow it should be fine.

    Myself I’d sell the TItan UL and just use the Mercury. It really is that amazing.

    I haven’t skied the One ; just the Mercury and Vulcan fyi

  27. Tyler December 20th, 2012 10:02 pm


    Would you ever be able to do a comparison review of boot shell volumes/fits? I know when I went into BootWerks here in Utah the first thing they did is examine my foot for shape and volume and then went right to the manufacturer whose shell’s are most appropriate for my foot shape. That’s the starting point for a good fit. Personally, I think it is hard to figure out best shell fit while in a store trying them on. I’ve finally decided that a good comfortable fit trumps my desire for a certain boot regardless of how new or fancy it is.


  28. Joshua December 20th, 2012 10:55 pm

    I just switched from the Cosmos to the Mercury. It was a great decision and I am really happy with this boot. The fit is much closer to the Cosmos than to the Maestrale, wich was too narrow for my foot.
    For those who like to know, Scott announced their 13/14 boot-line and the future-Cosmos will get a new tech insert! No one knows what will happen to the actual model – probably just nothing.

  29. Vincent December 21st, 2012 11:39 pm

    Lee, how is the skiability of the Mercury vs. the Titan UL? Does it ski equally well? And how does the Mercury walk on the dirt? I’m fine with the Titan UL in winter (once I get rid of this annoying plastic clicking when in walk mode) but I want something which gives me more performance in spring/summer when walking to the snowline and ideally doesn’t let me pay skiability…

  30. Lee Lau December 21st, 2012 11:41 pm

    I have lots of experience with Mercury in over the head pow but none walking in dirt. I walked around in the Vulcan in dirt and it walked fine – for a ski boot.

    The Mercury skis better than the Titan UL imo. It feels more progressive and smoother than the Titan UL

  31. XXX_er December 22nd, 2012 8:51 am

    The mercury skis fine without the tongue which weighs a mere 60 grams, I think most of the stiffness comes from that green beam in the back of the mercury when it locks into the upper shell, the tongues are symetrical labeled L & R, I was skiing them backasswards and they were fine, I think its easier to dummy down a boot than try to mod lesser boot up

    They walk great, I have walked on pavement to trailhead, I can drive my 5spd … lots of ROM

    Dynafit somehow made a 3mm shorter shell than my old garmonts with more toe room, the toe room is great the instep pressure is not but new liners will fix that, for kicks I tried stuffing the Dynafit liners into my slightly higher volume alpine shells but they just take up too much volume …another liner to sit on the shelf

  32. Lou Dawson December 22nd, 2012 5:14 pm

    I also haven’t skied the Mercury in anything but over-head pow (bummer, right?). Consequently I can’t really evaluate the stiffness yet. So far they feel great, pretty similar to the proto Vulcans.

    I haven’t skied the Ones, but I have a pair right next to me, and they are quite a bit different than the Mercury’s. The upper cuff of the Mercury is super stiff, much more stiff than the One’s.

    I’ve walked on dirt and rocks with the Vulcan quite a bit, and they are super comfy. On many approaches I opted to use the Vulcan’s, rather than bring shoes. The Mercury’s walk almost the same as the Vulcans, besides the slightly higher weight.

  33. Suizo January 3rd, 2013 12:33 pm

    Hello Lou and Co.

    I need your advice. I have a Dynafit Mercury. On the third day the spring of the middle buckle broke and I can’t fix it. Dynafit would replace the whole buckle for free. Maybe they have to rivet the boot with a new buckle.
    Now I’m not sure if this spring is necessary at all. I took the spring from the buckle and it seems to work fine. What do you think? What would you do?

  34. Lee Lau January 3rd, 2013 12:33 pm

    Suizo – that spring is a nice-to-have. It’s not necessary

  35. Suizo January 3rd, 2013 12:39 pm

    Lee Lau – Thanks… But don’t you think a boot in that price range should do a bit better on it’s third day?

  36. Lee Lau January 3rd, 2013 12:58 pm

    Of course. My opinion aside though is that its skiable without. I’d ski it. Or if I was really annoyed about it I’d ask Dynafit to replace it ASAP Which is the question you asked ie what would you do.

  37. Zeb January 3rd, 2013 1:02 pm

    For what its worth, the handle that helps pull up the tongue instantly broke on mine. Dynafit said that the turnaround time for a warranty repair is 3-5 weeks, so asking for it ASAP probably won’t happen. Like your defect, mine is probably pretty trivial, but I had expected better from the new–and expensive–boots. But they ski great!

  38. mark January 6th, 2013 12:28 pm

    Hey thanks for all the useful comments! I know a bunch of others have asked about the stiffness between the Vulcan and the mercury but I’m really in need of help asap so here goes!

    I’m in the market for new boots and would like to get some with tech inserts although currently 90% of my days are spent on framed bindings as I am then going to save up for some lightish weight touring specific skis.

    I currently have alpine boots and have tried a load of touring boots on and loved the vulcan however I’m worried it’s maybe too stiff (which I didn’t think possible from such a boot!!!). Until I get my tech set up I’ll be skiing sidecountry on Rocker 2’s and access touring on them/touring on much lighter but still relatively stiff 90-100mm skis.

    So my question is would the mercury be stiff enough for aggressive skiing on big skis or is it borderline, and in which case I should get the vulcan (presuming money no object!!!)?

    (I appreciate this is a pretty much impossible question to answer!!)

  39. mark January 6th, 2013 2:39 pm

    Also Lou could you let us know if the tongues in the Vulcan and Mercury vary in stiffness etc?

    Thank in advance!

  40. John January 7th, 2013 5:44 pm

    I have skied my new Mercury’s twice at a resort in mixed snow, man made + 6″ new snow. I skied G3 Infidels with radical FT bindings and Mantra’s with Dukes, and JJ ‘s with Radicals. The boots are much stiffer with the tongues than the BD Quandrant ‘s they replaced and not that far off from my Doberman 130 race boots. The boot is very comfortable and I got an excellent fit molding the stock liner myself. I like the lace up option being used to it with the Dobermans. I have not toured with the boot yet but will soon. So far I think they are a home run and I am very impressed with the thought and engineering that went into them. I am 5-7 145 lbs , any stiffer would not work for me these boots will drive anything I own.

  41. Chuck January 8th, 2013 10:44 am

    John, What size is your foot in US and what size boot did you get?

  42. John January 8th, 2013 11:15 am

    I wear a US size 7.5 for most shoes, size 8 in hiking boots. I had Scarpa Denali that fit perfect in a 24.5, I had 24.5 in the Black Diamond Quadrant and they were uncomforatbale even with an ultra thin race sock and I had them molded / fitted by a professional boot fitter, after another go round I gave up on the Quadrants. The Nordica Doberman 130’s were fit by a professional fitter and were terribley uncomfortable for two weeks now they fit perfect. I got the Mercury’s in a size 25, heated the liner myself with a blow dryer for 10 minutes with air that measured about 165 degrees, wore the liner in the boot for 30 minutes with a thin sock and I got a great fit. I wanted enough room for a mid weight sock for warmth / comfort and I got it. The buckle over the instep pulls the heel back and holds it there perfectly for me.
    I was not going for a “race fit” with these boots, I did get a tight fit that is starting out reasonbly comforatble. This is a boot I expect to where for 6 – 10+ hours touring.

  43. Chuck January 16th, 2013 9:26 am

    John and Lou,
    I’m a size US 8-8.5 mostly and have always been in a 26 shell. I was fitted again and two fitters want to put me in a 25 shell which felt super snug when I tried on. I skied the 26 (in the ONE, stock) and felt perfect on the up but noticed a little extra room while skiing down . I’ve always have had comfortably fitted ski boots, but not alot of extra room either. I’m sure I could get both 25 and 26 sizes to work ( I plan on using a custom foot bed also). Should I go with the recommendation on the 25 size and downsize to the 25?

  44. Fernando Pereira January 21st, 2013 12:06 pm

    I’ve been on Zzero 4s (Mondo 27, 306 mm shell) very happily for the last 5 years, but they’ve started to fall apart from heavy use, so I went in for a boot fitting exploration at The Backcountry in Truckee, where I had got the Zzeros too. After trying various options, I got a promising fit with Mercurys (Mondo 27, 304 mm shell), but concluded they are a bit too long. Mike at The Backcountry is trying to get the next lower size (Mondo 26.5, 294mm) for me to try the coming weekend. It was a bit of a surprise that the Mercury 304 mm seemed around 5mm longer than the Zzero 306 mm on a shell fit test, I can’t quite figure out why.

  45. Chuck January 21st, 2013 5:24 pm

    Fernando, I skied the 25.5 and the 26. My toes were not happy on the ascent in the 25.5. I’ll bet this will be the case for you too Fernando when you try the 26.5. I’m prob going with the 26 with a custom foot bed.

  46. Dy-curious January 30th, 2013 6:55 pm

    Just wondering Louie, did you have the same discomfort at the instep that you did with the Vulcan’s?
    Also, anyone know how the mercury skis compared to tlt 5 (or 6, as the case may be)?

  47. Martin February 4th, 2013 12:18 pm

    Hallo everybody!
    Interesting discussions. I bought a Mercury some weeks ago and did some touring in the alps. I am happy with performance, fit and walking mode. However, they are pretty stiff. I heard that some guys filed down the stops on the upper shell. As a result flex got smoother. Any experience and feedback? Regards from Switzerland.

  48. Lou Dawson February 4th, 2013 1:23 pm

    Taking out the cuff stops is a tried and true way of easing the feel of a boot. Problem is, you can’t put them back. New Mercury, if I’m not mistaken, has adjustable cuff stops that can be removed and replaced. Vulcan same. Super good on Dynafit for that.

  49. Josh February 6th, 2013 7:09 am

    Will one be able to retrofit those to current boots?

  50. Willis Richardson February 28th, 2013 7:44 am

    I have some crimping with the tongue on my Dynafit One and along the lower part of the boot. Dynafit is refusing to warranty the issue and claiming “user error’. I have talked to several retailers who have boots right out of the box never used which still have the crimping. I wondered if others are having the same problem. I think it might be a plastic composite issue Dynafit does not want to address. It has not interfered with the boots function nor worsened, but I expected an admission of a problem. I am attaching photos through the email. Again, anyone else having this problem?

    (Editor’s note: We uploaded the following photo that Willis sent us. It’s a mystery what could have cause this type of thing to happen to the tongue. As Willis says, it’s not getting worse nor interfering with the boot function.)

    Crimp on Dynafit One tongue

  51. Lou Dawson February 28th, 2013 8:23 am

    I have to wonder if when they packaged the boots at the factory, the tongue was somehow forced inside the lower shell? Or else someone in the shop trying the boots on accidentally forced the tongue inside? Getting the tongue in wrong is quite easy if you slide the tongue to the side and insert one side under the white shell, and one side over. I’m experimenting on some boots here, and if I do that it appears to dig into the tongue in the same spot that Willis shows in his photo.

    My take is if this crimp isn’t getting any worse, it seems like a non issue though I’d advise anyone buying ski boots to look for such damage while they’re still in the shop trying on the boots.

    Willis, is this crimp on both sides of the tongue, or just one?

  52. Willis Richardson February 28th, 2013 2:35 pm


    There is crimping on both sides of the tongue but not in equal measure or in exactly the same spot. There is some crimping with the shell very small, but I could not get a good photo.

  53. Lou Dawson February 28th, 2013 2:39 pm

    Willis, my theory is that someone, somewhere (not you) put one side of the tongue inside the white shell then buckled and flexed, then did it to the other side. I’ve observed quite a bit of use of these boots and that’s the only thing I can figure could have caused this. Once I have another pair here I’ll experiment. If the crimp has no effect on performance, let’s not get too crimped over it (grin). Lou

  54. Golden March 17th, 2013 11:41 am

    I just bought A pair of One boots and was told the Mercs. were a narrower fit.? Yet the LAST on the Dynafit website tells me that the One and Merc. are the same? any info pls.

    As well the store boot fitter removed the liner from the shell and heated them in a INTUITION oven!! me being the newbie to the sport got home and read the instructions which tell. “Do not remove liners from shell, use a air blower to acheive a 110 temp”. Now (24rs later ) at home while drooling over my tech setup the liners have 2 delaminating glue parts!!???

  55. Fernando Pereira March 17th, 2013 7:01 pm

    @Willis: I’ve recently got a pair of Ones, it’s really easy to crimp the tongue by trying to close the buckles without bringing the back of the cuff forward towards its ski mode position. I’ve seen that problem with other boots (I had it in an old pair of alpine Langes). It doesn’t really affect function, at least not with the minor crimping I’ve caused before I figured out the issue.
    @Golden: The liners of my Ones were heated in one of those ovens, but the fitter had them there for a shorter period than for Intuition liners, the fit worked well, with no damage at all.

  56. Lou Dawson March 17th, 2013 7:48 pm

    Golden, indeed, you can do the liners in an oven but an Intuition oven may have too hot a preset. I’ve melted the glue in a few pair of liners myself, doing that. As I’m sure you figured out, the store owes you new, properly molded liners. Lou

  57. Marcel March 17th, 2013 10:26 pm

    Have you guys been giving these boots some serious workout? Anything to say about durability?

  58. Fernando Pereira March 17th, 2013 10:36 pm

    @Marcel: A ski guide I know well has used his Ones many days this season without any problems. I was originally considering the Mercury, but on his advice I went for the Ones instead. I’ve used mine just two days, so I can’t comment on durability. They *feel* thin and light, but they ski very well, surprisingly stiff allround for such a light boot.

  59. John March 18th, 2013 3:12 pm

    I have about 20 days + on the Mercury’s, 5-6 days skinning in 12 -15 ” new snow, 4 days catskiing, going in and out of Radical Ft’s all the time getting in and out of the cats, and some resort skiing. Skied steep open bowls as well as steep tight trees. Skiig on both Armada JJ’s and K2 Sidestash’s. Absolutely no issues with the boots, very happy with them so far.

  60. Golden March 21st, 2013 6:42 pm

    Thanks Lou …the store has said they will set me up with Intuition not sure on the model…

  61. Golden March 21st, 2013 6:48 pm

    Being 6 2″ 210lbs without pack, Should I have spent more and gone for Mercury? instead of the ONE ?

  62. Lou Dawson March 21st, 2013 7:35 pm

    Golden, give the One a shot, they’re pretty stiff and high, depending on your style of skiing they may work just fine. Lou

  63. MarkE April 8th, 2013 4:16 pm

    Can anyone confirm BSL and last widths for the mercury/ vulcan? My current alpine boots are Lange RX 130s, with a 306mm BSL (26.5mondo) and 100mm last width, looking to see if either of these dynafit boots come in similar dimensions. Also can anyone comment on the heel cup, looking for a snug one. Thanks

  64. Fernando Pereira April 8th, 2013 5:46 pm

    @MarkE: Dynafit One mondo 26.5 has 294mm BSL. For the last width, I’d have to measure them (they are at home). Heel cup really snug, that’s why I got them. 26.5 is a tight fit for me. Mondo 27 is too long, although snug around at at the heel and instep.

  65. Golden April 10th, 2013 7:34 am

    Dynafit One, Mercs and Vulcans all come out of the same cast Dynafit told me @ 103mm forefoot. Call the # in colorado off their website good peps to chat with.

  66. Mark D. May 1st, 2013 9:21 am

    I love these Merc’s. But not the bump stop, can anyone who has ground them off please comment on the result. I’m concerned that the stiffness will be too greatly reduced, but I’d prefer a more progressive flex. For what its worth, I’m160lbs, 5’10 and ride a 112mm waisted ski @190cm. Thanks

  67. lederhosen 42 May 1st, 2013 9:48 am

    everything you can ever want to know about the merc bump stop removal/tongue mod available here:


    Personally, i faked the bump stop removal by taping in some plastic wedges so the cuff ‘glides’ over the stop as a test….the flex did become more progressive at the cost of the shell ‘collapsing’ at inopportune times. Conditions such as really deep, stiff coastal punchy pow, windslab, breakable rain crust over logs, strastugi in whiteout, reconsituted avy debris. I much prefer the bump stops intact with and without tongues and have adapted my technique to remain nice and upright with constant pressure on the tongues to drive the ski consistently in all conditions. I would suspect that removing the bump stops and adding the dalbello krypton tongue would be a good way to go as well based on buddy’s review.

  68. Mark D. May 1st, 2013 7:46 pm

    Thanks, I’ll try the wedges and mod some tongues. Appreciate the advice.

  69. Tim K May 2nd, 2013 4:25 am

    I’m not sure where golden got the 103mm # … i was told they were built on a 98mm last…. and my bill for punches seems to reflect that…..

    I did all the earlyup mods xcept the hokey cable bail…( just drilled another hole to make the buckle “longer” to accommodate the krypton tongue ridges ) and really like them, xcept for the fiddly time putting the tongue in, and actually i don’t mind it as much as my ski buddies…..

  70. Jimmi May 3rd, 2013 11:33 am

    I bought new BD Slants at the beginning of the season. I am happy with the stiffness, the range of motion could be better but is definitely tour-able (have done 10+ hour days in them), and I don’t care about weight that much. The down side is that when I ski, especially harder packed or heavier snow, I can feel my heel lift about half an inch or more even when the buckles/strap are so tight they cut off circulation.

    Earlier this season I got to use a pair of TLT5 Mountains and they fit like a glove, but I felt like they flexed so much they became a bit unpredictable when the snow was less than ideal. Basically I learned that Dynafit boots, right out of the box, fit my foot better than BD boots which have had their stock liners heat molded.

    Right now I covet the Mercuries but wonder if there is a cheaper solution. Would getting higher quality liners (intuition liners) fix my fit issues with the BD boots? How much of a fit depends on the shell and the buckle mechanisms? I know the Mercuries would be sweet, but could anyone compare the (cheaper) ONEs to the BD Slants or Quadrants in terms of stiffness

  71. manny June 27th, 2013 11:16 am

    @Willis: had the same “problem”. if you have a low profile foot and tighten the boot to it’s limits the tongue gets contact with the buckle. no performance loss though.

  72. Mac July 15th, 2013 10:30 pm

    Hi All,

    Just spent two days on my brand-spaking new Dynafit Mercuries at Craigieburn and Broken River club ski fields in Canterbury, NZ. I had previously been skiing the Garmot Radium – which I had no end of problems with. Seems they simply had too much volume for my feet.

    The Mercuries (Mercury’s?) were a revelation! While the snow was reasonably tracked out, they drove my 170cm K2 Hardsides effortlessly without the tounges fitted, even the occasional hard pack / ice patch didn’t present any issues (I’m 170cm & 75 kg or 5’7″ and 11 stone in old money).

    Skinning also proved to be much more comfortable than with the Radiums.

    The fit was a bit tight in the shop (especially over the arch of the foot), but once the liners were cooked, this resolved itself nicely.

    I’m itching to get them up on the North Island snow with the tounges in to see how they handle the “Mt Ruapehu powder” (ie ice)!

    I can definately see these boots doing sterling service as my quiver of one for both on-piste/side country (with tounges) to back country/touring without.

    The only issue I can see at present is that if you dial the fit in without the tounge, you’ll need to mess around to get it just so when you put them in.

  73. Daniel July 16th, 2013 11:53 am

    Anybody else having problems with the one/mercury/vulcan shell pinching the achilles? Basically the upper edge of the heel cup of the lower shell part. Hurts after minutes in the shop.

    For that reason I bought some leftover zzero4s as future atock…

  74. Fernando Pereira July 16th, 2013 1:13 pm

    @Daniel: My Ones are very snug around the arch and forefoot, I chose a deliberately tight fit for better performance. I’ve toured some 8 days in them (as well as a couple of resort days for fine-tuning) without any achilles issues, the only problems have been getting into them in the morning, and occasional cold/numb toes from the tight fit.

  75. Kameron Decker Harris July 17th, 2013 3:17 pm

    @Willis Just want to mention, I purchased “new” Mercury boots 1 week+ ago which also found the crimp issue. However, mine is in the white plastic tongue which, as far as I can tell, is mainly there to keep water out, not take any kind of force. More concerning is some light damage to the main shell, where this harder shell plastic bit into the white tongue flap. I’m pretty sure this problem happened in the shop.

    Kind of a shitty thing to find in a new boot. Dynafit does not want to fix–user error–neither does said shop but we’re working together on it.

    Seems like the shell plastic catches easily on the tongue because it is really sharp; this might be less common if they beveled or smoothed these vertical edges.

    Otherwise, I love the boot. Toured 2 big days in a row and had none of the blister issues that plagued me with Factors, and the Mercury boots feel stiffer! Killer walk mode.

  76. Pat Fortino December 10th, 2013 9:00 pm

    I find the mercury cuff stop really limits forward ankle flex especially walking up hill. Do you see any problem with filing them out. I certainly don’t need all the stiffness. Is that why they’re there?

  77. Lou Dawson December 11th, 2013 6:34 am

    Pat, removing the stops is no big deal for most people. In fact, I often recommend it. Lou

  78. Pat Fortino December 11th, 2013 8:10 am

    Hi Lou, thanks for the quick response regarding my question about removing the cuff stops on the Mercury.

  79. George March 4th, 2014 3:30 pm

    just got a pair of dynafit mercury’s in the mail as I’m trying to decide between it and the scarpa maestrale rs as my touring boot.

    Coming off of a dynafit titan and alpine boots before that.

    I see that the Mercury does not have cuff alignment (cant) feature.

    I was leaning towards this boot as it has the flex stops and I’ve been ok with the flex stops in the mercury.

    Has anyone retrofitted any cuff alignment/cant adjustment in the mercury?

  80. john February 23rd, 2015 5:12 am

    Hey Lou, I noticed yesterday the top buckle, the latch is loose just a bit at the rivets. wiggle room when in walk mode and just on 1 boot. could this be a problem? it felt solid when in downhill mode

  81. Jeff March 19th, 2016 11:40 am

    Village: Anyone know what size(s) of torx drivers one is supposed to use for the various adjustable parts on the Dynafit Mercury (or Vulcan, One or Guide GTX)? Trying to put together a repair kit for an upcoming trip and want to make sure to include the right size. Trial and error with torxs I have on hand is inconclusive. Thanks!

  82. harpo October 30th, 2016 12:23 pm

    notifications subscribed.

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