Specifications: The features that make this product unique are mainly three: anatomical construction; elastic tubular cotton cover and molded polyurethane foam protection. Designed for high-performance flexibility. Available in various colors. Size guide: To assess the size of the knee brace, it is necessary to measure the circumference of the leg, starting approximately 15 cm below the center of the patella. Proportional to the measured circumference, you can choose one of the following sizes.S 33-35cm | M 35 - 37cm | L 37-40 cm | XL40-45cm