Remedy Neoprene Knee Sleeve Support Closed Patella: * Neoprene mesh * Bound flexible edges for a longer lasting sleeve * Breathable area behind the knee * Extra small fits knee circumference (measured with leg extended) 12-13" * Small fits knee circumference (measured with leg extended) 13-14" * Medium fits knee circumference (measured with leg extended) 14-15" * Large fits knee circumference (measured with leg extended) 15-16" * Extra large fits knee circumference (measured with leg extended) 16-18" * Extra, extra large fits knee circumference (measured with leg extended) 18-20"