Features Original Fit has generous space across the forefoot for toes to splay Heat Trapolator technology: Three layers of heat-trapping materials underfoot 200g of KEEN.WARM Recycled P.E.T. insulation rated to -25°F/-32°C Notch in back for Achilles movement and comfort Metal eyelets for added durability Compression-molded foam midsole for cushioning Thermal Heat Shield insole captures warmth KEEN.POLAR TRACTION outsole for better grip on snow and ice 5mm multi-directional lugs for traction Stability shank delivers lightweight stability Materials Waterproof leather and performance mesh upper Breathable textile lining Non-marking multi-directional lugs for increased traction