45NRTH WÖLVHAMMER BOOT THE PINNACLE OF WINTER CYCLING FOOTWEAR Our vision for the Wölvhammer transcended traditional cycling footwear and originated from the conceptual standpoint of a mountaineering boot. On the inside we max out the insulation package with 200g Thinsulate on the forefoot and NASA-approved aerogel in the insole to block cold cleats. On the outside, 1000-denier Cordura and waterproof-breathable Sympatex block moisture and manage perspiration. For deep snow, easily add knee-high gaiters using the dedicated hook on the toe box. And of course, the Vibram sole is ready for any SPD-compatible cleat of your choice. These are the finest winter cycling shoes ever made.