The McDavid 429R Knee Brace with PSII Hinges is used for prevention of and recovery from 
MCL and ACL injuries. The bi-lateral geared polycentric hinges with hyperextension stops provide excellent support while allowing free movement of the complex knee joint while the padded buttress supports the patella.
3/16" thermal neoprene provides therapeutic heat retention and compression High-level support; improving medial and lateral stability, helping reduce injury and assist recovery Bi-lateral geared polycentric hinges for stability and free movement Engineered top and bottom straps assure personalized fit Latex-free neoprene provides thermal compression Open 360 Degree padded buttress isolates and supports the patella Bound edges and perforated back panel provides heat and moisture management and all-around comfort LEVEL 3: Maximum Protection Fits left or right knee
Product Description Fits both the left and the right knee. Available in the color black and in sizes small, medium, large, extra large and double extra large. Composed of 100 percent latex-free 4.8mm neoprene with exclusive binding, straps, cover fabric and hinges. To find your correct size measure the knee to be protected (you likely figured that). Stand and bend your leg just less than 45 degrees, measure around the largest part of knee, directly over the patella (kneecap).