Nylon/Spandex Sleep Leggings, Thigh-high, Open Toe - Sleeping, Yoga, Gym, Warmth, Compression Toeless Socks. MATERIAL : Soft, comfortable nylon & spandex blend hugs the skin. LIGHT COMPRESSION : Light compression increases blood flow, reduces likelihood of varicose & spider veins. WARMTH LAYER : Wear them alone or under other garments as a warmth layer. DESIGN : Open toed design prevents bunching inside shoes. SIZE : Small/medium fits calves 10-13". Medium/large fits 14-15".