If you're looking for a professional, medical-quality knee brace, you're going to find it in the McDavid PSII Hinged. The brace comes equipped with a two geared polycentric hinged stops, and it also incorporates rubber condyle pads and stop to cushion the knee. Employing aircraft-grade aluminum gears that flow with the natural movement of the knee, this brace provides unsurpassed support without restricting movement, uunncessarily. Features: * Comes with a geared polycentric hinge * Molded condyle pads for superior fit and comfort * Thermal sleeve for soothing, effective therapy * Seamless design for better breathability and comfort * Fits either knee Warning: Do not apply over open wounds or if you have a susceptibility to dermatitis Sizing (measure around knee): Small: 12 - 14 inches, Medium: 14 - 15 inches, Large: 15 - 17 inches, X-Large: 17 - 20 inches, XX-Large: 20 - 22 inches McDavid Product Number #429