Sorel - Caribou Reserve (Bison) - Mens: The Caribou you know and love, with a few luxury touches added to give it that extra measure of individuality. Each pair is truly unique, as indicated by the limited edition number stamped on each pair, and only 1000 pair will be available worldwide. Waterproof bison leather upper with a seam-sealed waterproof construction. Solid brass D-rings. Texel felt InnerBoot is fully lined with genuine sheep shearling. Full-length Poron insert is place underfoot for cushioning and comfort. Handcrafted, waterproof vulcanized rubber shell. Sorel AeroTrac non-loading, natural rubber outsole. Temperature rating: -40 F/-40 C. Weight: 2 lbs. 15 oz.