Wonzone Fitness Knee Brace Gel Force Compression Support Sleeve for Sports, Arthritis, Joint Pain, Injury Recovery and More! 70%Nylon, 15%Spandex, 15%Rubber Thick gel provides comfortable stabilization to the knee, and absorption of dynamic forces. Medial and lateral sprial stays provide knee joint stability. 4way stretch material provides supportive compression while allowing full range of motion. Light, breathable fabric keeps skin dry reducing any fabric irritation. Sizing Chart Item Medium (14  19"); Large (19  22.8) (Circumference measured 3 above top of patella) Perfect for a range of activities including Basketball, Crossfit, Dance, Hiking, Tennis, Volleyball, Walking, Weightlifting, Yoga, and Zumba. Experience premium knee support without compromising your performance.