Promote Healing & Protect Injured Knees Specially-treated bamboo fabric uses Far Infrared technology which retains body heat to ease pain and speed healing. Contoured silicone insert surrounds the patella & stays in place all day, allowing you to bend, sit and walk with ease. Wear comfortably under clothing. 43% Nano Bamboo fiber, 21% Spandex, 19% Nylon, 17% Lycra®. Hand wash. Specify size: Measure circumference of knee. MD(10"- 12") or LG(12"- 14").