The North Face Men's Chilkat 400 II Winter Boots is a waterproof, cold-weather leather utility boot that's insulated for extreme warmth. These boots are made with a waterproof construction for the ultimate weather protection and feature an anatomically engineered, injection molded, waterproof TPR shell. The Chilkat 400 II are equipped with PrimaLoft® Silver Insulation Eco for top-tier warmth in conditions all the way down to -40°F. These boots feature a durable outsole with IcePick®temperature-sensitive lugs for ultimate traction. Winter conditions can be tough. Luckily the Chilkat 400 II Boots are tougher.