An all purpose winter boot, The North Face Chilkat II features Heetseeker insulation for warmth to 25degF and a Winter Grip outsole for exceptional grip on frozen terrain. . 200 g Heatseeker synthetic insulation for warmth to 25degF 32degC. Durable TNF Winter Grip rubber outsole for maximum traction in subzero temps. Compression molded EVA midsole for cushioned comfort and support. Waterproof leather upper with waterproof construction to keep feet dry. Anatomically engineered injection molded waterproof TPR shell with forefoot flex grooves for an easy stride. Injection molded nylon shank plate for underfoot support. Rustproof hardware with a gaiter compatible D ring. Fleece collar and tongue lining to wick moisture and enhance warmth. Lastfit: Generous and all day comfortable fit with sufficient room for winter socks and layering. This boot tends to run small please order next size up.