Mueller Pro Level Hinged Knee Brace Deluxe Features: Pro-level packaged in plastic bag Adjustable straps provide controlled compression for custom fit Extra long for maximum stability and protection Ideal for active individuals during physical activities Padded protection with double layer at knee Ideal for weak, injured and arthritic knees, stiffness, and arthritic knee condition Lockout option for complete immobilization and adjustable extension stops at 10, 20, and 30 for limited range of motion if used as a rehab brace (tool kit included) Mueller Pro Level Hinged Knee Brace is designed for the serious athlete, this high performance brace is ideal for weak or injured knees needing maximum medial/lateral support without restricting mobility. The patented triaxial hinge properly tracks the knee joint and produces near-normal joint motion of the knee, allowing you to uninhibitedly perform at your peak. Ideal for active individuals during physical activities and for for weak, injured and arthritic knees. Sizes (Measure 7 above and 7 below the center of the knee): Small fits 13 - 14 At Calf and 17 - 18 At Thigh. Medium fits 14 - 15 At Calf and 19 - 20 At Thigh. Large fits 15 - 16 At Calf and 21 - 22 At Thigh. X-Large fits 16 - 17 At Calf and 23 - 24 At Thigh. XX-Large fits 17 - 18 At Calf and 25 - 26 At Thigh. XXX-Large fits 18 - 19 At Calf and 27 - 28 At Thigh.