McDavid 421 Patella Knee Ligament Support / Brace & Thick Neoprene Sleeve The McDavid 421R Patella Knee Support gives minor ligament support and helps to relieve the symptoms of chondromalacia, patellar subluxation as well as patellar tendinitis. In addition it features a long, thick neoprene sleeve with nylon facing on both sides. Key Features : Provides minor ligament support Helps relieve symptoms of chrondromalacia, patella subluxation and tendonitis This 100% latex-free Neoprene Fits left or right knee WARNING: Do not apply over open wounds or if you have a susceptibility to dermatitis What size do I need? Measure around the middle of the knee. Small = 30-36cm (12-14inches)Medium = 36-38cm (14 -16inches)Large = 38-43cm (15 - 17inches)X-Large = 43-51cm (17-20inches)XX-Large = 51-56cm (20 - 22inches) Colour Black Size S-XXL Model 421R-BK