10.5 to 12.5-Inch (26.7-31.8 cm). Firm support. Helps reduce the chance of re-injury. Futuro offers a wide range of quality products to support your active life. Each and every product is designed for comfort and fit combined with a natural appearance. Designed to provide firm and comfortable support. Designed to help support the knee cap (patella). Absorbent fabric helps pull perspiration away from skin. Helps relieve tired, aching muscles and joints. Reversible for right or left knee. How it works: The design of this quality Spiral Lift Knee Support reaches out and embraces the weak and sore muscles above and below the knee, supporting them like a firm, invisible hand. Not only does this product offer firm support, its design permits movement without slipping or rolling. It is easily reversible for left or right knee. Available only from Futuro. How to Determine Your Size: Measure around the knee at knee cap. Sizes are the same for both male or female. This knee support is carefully designed to provide comfort and fit to support your active life. Made in USA.