Ideal for active individuals during sports and other physical activities. This self-adjusting brace provides maximum medial-lateral support. Maximum Support Level for weak, injured and arthritic knees. Metal hinges help protect knee from hyperextension. Open back eliminates bunching. Perforated fabric increases breathability. Adjustable – One size fits left or right. FSA Eligible. Caution: Product contains natural rubber latex which may cause allergic reactions. Measure around leg, 3″ above knee: (13-21″ or 33-53 cm).