The knee sleeve helps support circulation and muscle recovery time for athletes and workers alike. Compression warms and supports muscles to reduce stiffness, soreness, strain and fatigue, while the lightweight polyester and spandex material flexes with you and wicks away sweat for all-day wear. Features copper infusion plus anti-microbial finish. Made of 82% polyester / 14% spandex / 4% copper and other fibers. Thigh area sizes: 15.5-16.5" medium, 17-19" large, 19.5-21" extra large.