The The Hg80 Premium Hinged Knee Brace is simply the most comfortable brace you'll ever wear. Improved Mueller-exclusive HydraCinn fabric is a high-performance moisture-wicking material with an anti-microbial barrier.* The ultimate brace for weak or injured knees. The Triaxial Hinge is the standard by which all other hinged knee braces are judged. It closely simulates the natural tracking of the knee joint. Recommended to help control sublaxating patellas and to help relieve pain associated with Chondromalacia (irritated kneecap).LIGHTWEIGHT & NEOPRENE-FREEUpper strapping locks brace in position; upper bidirectional stretch material is form fitting and fully adjustable. Instructions: Loosen all straps. Slide brace on. Align kneecap just above buttress. Fasten large top and bottom areas behind knee. Secure upper and lower straps. Care: Remove hinges before washing. Hand wash in cold water with mild detergent. Do not use bleach. Do not iron Do not dry clean Sizing:(measure around center of knee)SMALL: 12-14 in 30-35 cmMEDIUM :14-16 in 35-40 cmLARGE 16-18 in 40-45 cmX-LARGE 18-20 in 45-50 cmXX-LARGE 20-22 in 50-55 sm