Full, 600 gram Thinsulate Ultra thermal lining. Made with all terrain, TPU soling technology consists of a lightweight, shock absorbing, polyurethane (PU) midsole and a durable, thermoplastic urethane (TPU) outsole. COMFORTcushion uses a combination of a cellular urethane and PORON for impact absorption to help reduce foot, leg and lower back fatigue. NATUREform Type 1, high-impact composite, non-metallic toe cap offers a wide profile shape to accomodate a wider foot and toe spread. Water-resistant, full grain black leather, with a SYMPATEX waterproof membrane liner. The outsole is heat-resistant up to 266° F (130° C) surface contact. PORON XRDTM, extreme impact protection, metatarsal guard is soft and flexible, hardens upon impact. Lace-locking device makes it easier to lace up boots and keep snug fit.