The Baffin Shackleton Boots are engineered for the most extreme arctic conditions. Rated for temperatures down to -148 F (-100 C), they feature a multi-layer inner boot system including double layer B-Tek insulation and a double aluminum insole with waffle comb footbed. The outer shell consists of waterproof leather with a lower rubber guard and cinchable nylon snow collar. Large D-Rings and a lace drawcord allow a quick and precise fit. Features: - Waterproof leather upper - Multi D-Ring lacing for fastening - Waterproof nylon snow collar - Liner: Removable, multi-layer inner boot system featuring double B-Tek insulation,a double aluminum insole and a waffle-comb foot-bed - Base: Arctic Rubber Shell, EVA Midsole, Polar Rubber Outsole - Temperature Rating: -100C/-148F