Keen Blackcomb Dual Climate Rubber outsole hardens in the cold and bites packed snow for traction Dual-density compression-molded EVA midsole for cushioned support Waterproof, breathable Keen.Dry membrane keeps water out Thermal Heat Shield footbed: foil barrier on the inside harnesses radiant heat Footbed has a woolly top for warmth/softness, with a cushioned middle for support