Comparison review of Dynafit Hoji Pro vs Hoji Free ski touring boots, both would work fine for backcountry, Free is much stiffer, with less volume.
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Review of Fischer Ranger Free 130 ski touring boot, for backcountry mountaineering and free skiing.
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Review of book Free Heel Skiing by Paul Parker, covers telemark freeheel technique but also applies to alpine skiing, backcountry and mountaineering.