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 studyi ng 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. Wide edged band keeps sleeve securely in place. Boosts blood flow to the muscles, increasing oxygen supply for quick recovery. Warms leg muscle s to protect against injury. For sizing: measure the circumference of your calf at the thickest point. Short sleev e fits 10 1/2 - 12 inch. NOTE: Package includes two sleeves.