A superior cold weather boot, the Men's Baltoro 400 from The North Face is a durable, high traction winter style that will keep you warm in the most severe conditions. A popular style for ice fisherman on Lake Champlain, the Baltoro 400 features full waterproof protection and a durable rubber outsole that will protect your feet. The upper part is waterproof nubuck leather which looks good and gets the job done even after serious use. The Baltoro 400 Boot is insulated with 400 gram PrimaLoft Eco insulation which gives it a -40F rating.