McDavid Sports 401 Knee Support / Brace 100% Neoprene Sleeve 4 Way Stretch The 401 Knee Support is a primary knee support that features an 11& 39;& 39; thermal Neoprene sleeve with nylon lining on both sides. It has reversible colors and a 4-way stretch. Made of heavy duty material outside for durability, it is also contoured and darted for the best possible fit. Key Features : Protection level 1 (Primary) 11" long sleeveReversible colours (black to scarlet) Thick, 100% latex-free Neoprene construction Fits left or right knee Caution: 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 401