Bauerfeind works with athletes to design the best products for athletes. The Bauerfeind range is made for the competitor who works equally as hard in training as in the game, made for the amateur or professional who wants improved performance.By studying elite athletes, Bauerfeind sports scientists have created innovative protection for muscles and joints. The line of compression technology improves the flow of oxygen to the body for increased circulation, better endurance, less fatigue and quicker recovery time. 3D Airknit technology is light and breathable, and anatomically designed for the perfect fit. Special functional zones are flexible and stable. Knee Support massages ligaments, muscles and tissue while protecting against strain and injury. Patella pad absorbs pressure away from the kneecap. For sizing: with knee slightly bent, measure from the center of the kneecap 5 1/2 in above to 4 3/4 in below.