The waterproof cattle hide leather and 1000D Cordura? nylon of the AR 670-1 compliant Series 100? 8 Waterproof boot can be pulled snug with the quick and easy NATO speed lace system. A special gusset behind the laces helps keep water out while the triple density rubber foundation and an arch made from a durable compound will hold up to the rigors of fast-roping. Premium memory foam insole adds an extra all-day layer of comfort and true U.S. sizing provides a superior fit with excellent weight distribution for men and women (see conversion size chart).