This is a Body Glove 3012A Airprene MVP Knee Brace. It features: Body Glove QUALITY These braces run a little bit smaller than a true size - if you are in doubt, you may want to go up a size 12 1/2 sleeve; constructed with patented "Airprene" neoprene Designed with two lateral and two medial spring steel stays on each side; provides additional support to the ligaments, without restricting flexing of the knee Smooth, nylon lined interior and durable nylon exterior Padded, open patella design that eliminates pressure on the patella; allows the kneecap to protrude through the front Retains body heat and generates warmth that improves circulation and enhances muscle flexibility Provides firm yet comfortable, compression and soft tissue support, and offers relief from non-specific pains, stiffness, tendonitis, bursitis, arthritis and minor sprains Protects the surface of the skin from scrapes and abrasions Sizing Chart: Measure leg circumference at a point 3½" above center of patella (knee cap). Please Note: The sizing chart measurements are to be used as a guide only, They may not be exact. Small 13"-14" Medium 14"-15" Large 15"-17" X-Large 17"-19" XX-Large 19"-21"This Body Glove 3012A Airprene MVP is great for all sport uses. Less suitable for water sport uses.