The Incredibrace knee support is designed for a young adult to adult with arthritis or other disabilities which affect the knee joint. The Incredibrace is made out of soft and stretchy material and fits snugly around the knee, from mid-thigh to upper-calf. The Incredibrace is retains heat around muscles, helps promote blood flow and healing. It is made from germanium fiber, bamboo charcoal, and spandex. Is machine washable. SIZES/MEASUREMENTS: Measure around the kneecap: Medium is 12 inches to 14 inches, Large is 14 inches to 16 inches, Extra-Large is 16 inches to 18 inches, and Extra-Extra-Large is 18 inches to 20 inches.