Ideal for sprains, tears, arthritis or knee joint instability. Stays put with adjustable support straps plus silicone strips in back area. Front opening lets kneecap protrude, avoiding bunching and chafing behind knee. Neoprene generates therapeutic warmth. Metal hinges stabilize yet allow full flexion without hyperextension. Fits right or left knee. Black. Specify size: Measure circumference 4" above the kneecap. SM(14"- 15"), MD(16"-17"), LG(18"-19"), XL(20"- 21"), 2X(22"-23") or 3X(24"-25".