specification Material: SBR fabric Size: 21*52cm Applicable sports: cycling, mountaineering, running description: Reduce knee and joint pain Prevent sprains and help recover from sports injuries Adjustable Velcro belt to fit adult knees Good ventilation, good sweat absorption Comfortable and not allergic to skin Washable, strong and long lasting Function: soft texture, breathable and sweat-absorbent, protect knee joints, and protect knee joints from injury during exercise Suitable for sports, protect knee injuries, protect and provide muscle support, durable and comfortable to wear, with strong breathability and water absorption.