Black Crystal Mountaineering Hiking Gaiters Gore-tex Nylon New Men's Black Size Medium Upper portion 1500D Gore-Tex waterproof breathable durable fabric Lower portion 1000D durable waterproof nylon fabric Adjustable upper and underfoot straps, professional grade TPU underfoot straps Upper opening and front closure Velcro zipper DURAFLEX straps and buckles, durable in cold weather. Metal hook at the bottom to fasten to shoe lace