Constructed Carhartt strong in oil-tanned leather and abrasion-resistant Cordura nylon, their 11-inch bison work boot/non-safety takes on the most rugged conditions. Featuring a waterproof membrane with direct-attached welt construction and a dual-density PU (polyurethane) outsole, it's oil, chemical and slip resistant. An OrthoLite insole adds comfort, and a molded TPU (thermoplastic polyurethane) heel counter provides support.