Updated for more underfoot comfort and a lighter weight, the Men’s Chilkat V 400 Waterproof Boots still boast our warmest package of Heatseeker Eco insulation for comfort on cold winter adventures. The waterproof footwear incorporates a variety of advanced waterproofing materials, treatments, and processes. To help keep feet dry, we use internal waterproof membranes and/or adhesive and seam seal constructions.