These Carhartt 10'H Composite Toe Leather Pac Boots aren't just footwear, they're cold-weather equipment. Insulated with 1,000g of LiteFire insulation, which gets sprayed onto the boot lining as a gas. When it dries, it’s super-thin and equivalent to having 1,000g of heavyweight thermal insulation (Thinsulate-type insulation without the bulk). Pac boots are oil-tanned leather with abrasion-resistant Cordura upper shaft. OrthoLite insoles and waterproof membrane. Oil, chemical and slip resistant. Men's whole and half sizes 9-14 (no half sizes 12-14). Carhartt Men's 10 Insulated Composite Toe Pac Boots