COPPER ANTI-FATIGUE FOOT SLEEVES provide soothing relief for tired, achy feet. Copper-infused, toeless socklets deliver targeted compression to all areas of the foot—heel, arch, ankle, plantar fascia—to help improve circulation and reduce swelling and pain. Wear under socks and in most shoes. S/M fits women’s shoe sizes 6-9½, men’s 5-9½; L/XL fits women’s sizes 10-13½; men’s 10-12½. Nylon/spandex/elastic blend. One pair.