DESC: Inner sleeve features a form fitting hourglass design and exclusive moisture-wicking HydraCinnfabric which is latex-free and neoprene free. Flexible steel springs support both sides of knee, yet allow leg flexion and extension. Free nylon mesh laundry bag shields clothing from hook & loop straps in gym bag or washing machine. Please specify size. SM 12"- 14"; MD 14"-16"; LG 16"-18"; XLG 18"-20"