Made of super breathable bamboo charcoal fiber, warm, dehumidifying, stretchy, non for slip, non-deformed, comfortable to wear. Can be stretched 2-3 times to fit yours knees, you can wear it under your pants and no sense of manacle. Can help to reduce swelling, inflammation, stiffness and soreness in muscle recover. Provides great support, you can enjoy demanding sports like basketball, football, volleyball, jogging, cycling, biking, running, climbing, tennis, weight-lifting and more. It can help dissipate for heat and absorb sweat in Summer. Comfortable fabric is in good for contact with your skin, making it breathable rather than sultry. It will protect your knees and keep you warm in Winter. Specification: Color: Gray Material: Bamboo Charcoal Fiber Size: S, M, L approx. S Central perimeter 26cm/ 10.2 inch Big Head Circumference 28cm/ 11.0 inch Small Head Circumference 24cm/ 9.4 inch M Central perimeter 28cm/ 11.0 inch Big Head Circumference 32cm/ 12.6 inch Small Head Circumference 26cm/ 10.2 inch L Central perimeter 32cm/ 12.6 inch Big Head Circumference 33cm/ 13.0 inch Small Head Circumference 30cm/ 11.8 inch Package Includes: 1Pair Knee Compression Sleeves Note: Please allow 0-1cm error due to manual measurement, thanks.