The Cho-Pat Dual Action Knee Strap provides full mobility with the benefits of Dynamic Pain Diffusion and extra dimension of relief from painful and weak knees. The Cho-Pat Dual Action Knee Strap supports you above and below the knee to provide immediate relief from Jumpers knee and weak knees. Its exclusive range of sizes ensures a better fit and maximum performance. The Cho-Pat Dual Action Knee Strap applies pressure above and below the knee upon the patellar tendon below the kneecap to stabilize and tighten up the kneecap mechanism, which improves patellar tracking and elevation and reduces patellar subluxation. It offers pain relief and protection from knee degeneration and overuse syndromes. It adds further strengthening to the kneecap mechanism by applying pressure on the tendon above the kneecap as well which tends to reduce the forces of the quadriceps on the patella tendon and erosion of the undersurface of the kneecap due to a possible misalignment of the quadriceps (Q angle). The strap support is far superior to any single patellar strap due to providing stability without inhibiting motion. Activities can now be accomplished with the Cho-Pat Dual Action Knee Strap that otherwise could not be performed because of pain and inflammation. For maximum performance, properly measure to find the correct size. Measure around the leg at the center of the kneecap and follow the sizing chart. The purchase of this product includes 1 knee strap.