After Sale Service - We will do whatever we can to ensure you feel satisfied with our knee strap. For any question, please feel free to contact us via 'Your Account - 'Your orders' - 'Ask Question'. Non-slip and Adjustable Size for Optimal Performance - Double silicone anti-slip stripe can effectively prevent the slide and movement of the knee support in high intensity exercise. Adjustable Size: Size (XS-M) for knee circumference 12.5" to 18.5", Size (M-XL) for knee circumference 18.5" to 22.5". How to measure - the knee size: Measure the thigh circumference 4''(10cm) above the kneecap. Breathable and Lightweight Fabric for Maximum Comfort - 100% latex-free, Premium grade spandex & nylon, the knee supports help to reduce unwanted moisture, itchiness and odor. The knee patella support strap will bring you super comfortable wearing experience. Open-patella & 4xSpring Side Stabilisers & 3xIndependent Straps - With all the features, the knee brace supports your knee from all sides, increased stability leads to improved leg alignment for optimal loading and recovery. The open patella design and spring strips strengthen the support and assist the stability of the knee joint to absorb impact. Perfect Knee Supports for Active Lifestyles - This upgraded knee brace ensures the kneecap stay in proper position and reduces pressure during flexion & extension, help relieve pain and injury rehabilitation for ACL, PCL, LCL & MCL.