The Salomon Trail Gaiters are unique gaiters, high-performance gaiters designed to protect your running footwear from trail debris and keep it from entering you footbed. Durable stretch fabric hold snuggly to your shoe and ankle to not impeed your stride or get caught by trail debris. The fabric is higly breathable, so your feet stay won’t over heat. The unique, non-abrasive connection system patented by Salomon keeps the gaiter in place. Easy on/off with Velcro closures. Durable, reinforced under-strap keep the gaiter in place but would snag underfoot. Sizing : Small: US Men's 4.5 - 7.5 / Women's 6 – 9, Medium: US Men's 7.5 - 9.5 / Women's 9 – 11, Large: US Men's 9.5 - 12 / Women's 11 - 13.5. *Compatible with low-cut footwear (not three-quarter top or boots) with an outsole arch (recessed groove for the under-strap).