45North's Wölvhammer are winter cycling boots with a mountaineering boot soul. On the inside, 45North maxes 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, yet breathable Sympatex outers block moisture and manage perspiration. For deep snow, you can easily add knee-high gaiters (sold separately) using the dedicated hook on the toe box. And of course, the Vibram soles are ready for any flat pedal of your choice. Say good-bye to cold, and hello to comfort.