These Columbia BUGABOOT Celsius II Snow Boots are designed for winter excursions, featuring a heavily insulated interior and a waterproof yet breathable exterior. The shell rubber construction ensures a slush-ready grip for safe walks in the city or apres-ski activities. The boots are made with a rubber shell/outsole and a waterproof PU coated leather and textile upper. They include an Omni-Heat reflective lining, 400g insulation, and Omni-Tech waterproof breathable construction. The closure system uses a bungee cord. Please note that laces and zippers incorporated in Columbia footwear are not waterproof.