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Built for fatbiking in extreme winter conditions, the 45NRTH Wolvhammer MTN Boot keeps our feet warm and dry while providing efficient power transfer to your clipless pedals. 200g of PrimaLoft insulation in the lining keeps our feet warm in frigid conditions, and a roomy toe box promotes comfort and extra insulation. Aerogel on the footbed provides extra insulation that maintains compatibility with custom insoles and helps to seal out the cold from the metal cleats. The closure is a BOA dial that provides a wide range of adjustment. The fiberglass-injected nylon sole provides a stiff platform for quick power transfer to the pedals along with a high degree of impact resistance. The outsole is made of grippy rubber lugs that are infused with anti-slip microglass, providing unwavering traction for those times when you have to hike-a-bike in icy conditions.