MUELLER The Jumper's Knee Strap is designed to improve patellar tracking and elevation by applying mild pressure on the tendon below the kneecap. This helps reduce the effects caused by frequent running and jumping and provides relief from chondromalacia (irritated kneecap). Tubular insert provides focused, uniform pressure to help guide the patella. Fully adjustable and comfortable for all-day wear. One-Size-Fits-Most