Purpose built for the U.S. Army, the Belleville Khyber 400g Thinsulate Waterproof Boots outperforms on mountain terrain, concrete roads, or anywhere else. This AR 670-1 compliant boot features a VIBRAM. Ibex rubber outsole that delivers unparalleled gripping power and a TR-1. load bearing orthotic insole and shock absorbing midsole reduce fatigue. 400g of Thinsulate™ insulation and a durable water and bloodborne pathogen proof membrane protects your feet from cold, water, and infection.