Thanks to a heavily insulated interior and a waterproof yet breathable exterior, these boots are ready for winter excursions. The shell rubber construction provides a slush-ready grip for safe and steady walks in the city and even apres-ski days. Injection molded rubber shell/outsole Waterproof PU coated leather and textile upper. Omni-Heat reflective lining. 400g insulation. Omni-Tech waterproof breathable construction. Bungee closure system Please note: Laces and zippers incorporated in Columbia footwear are not waterproof.