Heatseeker warmth, waterproof protection, Winter Grip traction, and pull on ease combine to make The North Face Chilkat II a great everyday boot for winter weather. . 200 g Heatseeker synthetic insulation for warmth with minimal bulk warmth rated to 25degF 32degC. Durable TNF Winter Grip rubber outsole maintains high grip in subzero temps. IcePick temperature sensitive rubber lugs harden when temps fall below freezing for ultimate biting traction. Waterproof construction for the ultimate weather protection. Waterproof, BLC compliant full grain leather upper for durability and support. Waterproof TPR shell: Anatomically engineered and injection molded with forefoot flex grooves for a comfortable stride. Compression molded EVA midsole and internal nylon shank for cushioning, support, and stability. Gore elastic side panels for easy onoff. Dri Lex fleece lining in collar. Rustproof hardware. Fit: Generous and comfortable all day wearing last has sufficient room for insulated, winterized socks and layering. This boot tends to run small please order next size up.