Size M: fits leg circumference 35 to 41cm, weight 45 to 60kg. Size L: leg circumference 42 to 47cm, weight 65 to 75kg. Size XL: leg circumference 48 to 55cm, weight 75 to 100kg. Knee Support: Knee braces with excellent lengthened 3D design provide a perfect 360 fit for comprehensive protection and warmth from your calf to thigh. With our sleeve, you can effectively prevent injuries caused by exercise or any activity that puts pressure on your knees and calf muscles. Instantly increase your performance and confidence. PAIN RELIEF & FAST RECOVER: Our knee sleeves with true graduated compression can promote blood circulation and oxygen flow to relieve knee and calf pain. They are perfect for arthritis, tendonitis, swelling, meniscus tear, strains, sprains, calf cramps and recovery after surgery. PREMIUM DESIGN : Our knee sleeves are designed with elastic compression straps on the top, which can keep your sleeves in place without sliding down no matter what you're doing. The delicate sewing upper and lower cuffs fit tightly to the leg without limiting your mobility. Lightweight and breathable 3D knitted fabric provides all day superior comfort. OUTDOOR ACTIVITIE}: Suitable for all activities and exercises that require to use your any joints a lot such as Basketball, Volleyball, Football, Tennis, Baseball, Running, Weightlifting, Gym Fitness Training, Jogging, Hiking, Crossfit, Golf and more. Comfortable to Wear and Anti-slip System: Special knitted technical design with two silicone gel strips, ensuring the knee sleeves stay in place, no matter what you do The high quality fabric featured in Breathable & Sweat-Absorbing gives you a smooth and soft feel so you can wear them all day long The compression knee supports fit for both men & women, kids and adults.