The ultimate brace for weak or injured knees needing maximum medial/lateral support without restricting mobility. This brace helps control subluxating patellas and aids in the treatment and relief of Chondromalacia (irritated kneecap). Wraparound design for easy on and off. FEATURES: High strength patented triaxial hinges allow unrestricted natural knee movement. Adjustable straps provide controlled compression for custom fit. Patella buttress stabilizes and protects kneecap. Fully-trimmed edges with smooth seams prevent irritation and chafing. No bunching with open back design. Sizing Chart (Measure Around Center of Knee) Size FitsRegular 12" - 16" / 31cm - 41 cmLarge 16" - 20" / 41cm - 51 cmXtra Large 20" - 24" / 50cm - 60cm