McDavid 4200 Bio-Logix Hinged Knee Brace Bio-Logix engineered semi-rigid lightweight and highly-supportive brace Over-molded integration of anatomical lateral/medial C-Supports for unique hinge bracing and continuity Self-adaptive Flex-Fit allows for full adjustability and custom-like comfort Fluid feel and natural range of motion via bi-lateral aluminum dual axis geared hinges Flex-Fit shin and thigh, wicking and washable lining pads with airflow channels Anti-Migration Straps for adjustable precision fit Innovative Sleeve-Lock Fit System compression sleeve wraps over brace exterior/straps adding support and fit Wear with or without included compression sleeve Anatomically specific for right or left knee PATENT PENDING 45% ABS, 25% TPR, 5% PA , 2% TPU, 3% nylon, 5% POM , 15% metal, Sleeve content: 50% nylon 30% polyester 20% spandex—exclusive of trims Measure the knee to be protected (you likely figured that). Stand and bend your leg just less than 45 degrees, measure knee circumference 2" (5cm) below the center of patella (kneecap). Size Inches X-Small 11.5 - 12.5 Small 12.25 - 13.25 Medium 13 - 14 Large 13.75 - 14.75 X-Large 14.5 - 15.5 Les mer