Classic Equine Pro Tech Boots Hind Large Black Body is made of three breathable layers. Outer layer is nylon for durability. Middle layer is perforated neoprene for support. Inner layer is a soft jersey for comfort. Rugged molded shells are stratigically placed for protection of the inner splint area, the tendon area, and the fetlock area. Constructed with darts for a close clean fit and bound with lycra to keep the dirt and debris out. Fastened with a simple but secure, easy on, easy off system of hook-and-loop straps.