What is the Mueller Max Knee Strap? Relieves pain on the outer side of the knee caused by Ilio Tibial Band Friction Syndrome (Runners Knee). This patented dual action knee strap provides force above, as well as below the kneecap. When can I use it? Perfect for the relief of symptoms of mild to moderate Ilio Tibial Band Friction Syndrome (Runners Knee). Can be used in all sports, not just running. Which size do I need? One size fits most between 30.5-45.5cm circumference. How does it work? The Mueller Max Knee Strap features upper & side compression tubes that target misalignment of the knee & help improve patellar tracking. It works by providing a compressive force targeted above & below the knee cap. This pressure provides restraint to the knee cap & surrounding structures. This helps to prevent a knock kneed posture, otherwise known as squinting patella. This is important as a knock kneed posture can increase tension in the Ilio Tibial Band & cause Runners Knee. By correcting knee cap posture the Mueller Max Knee Strap relieves strain on the Ilio Tibial Band & this reduces the friction that causes Runners Knee pain during running activities. The knee straps breathable, mesh fabric allows for an all-day comfortable fit.