Ideal sock where the back muscle chains work at high intensity or long duration. Supports and protects the Achilles tendon. Internal fixation with copolymer. Coolmax Technology It incorporates a copolymer on the inside of the cuff to prevent sock movement during all sports practice. With two anchors and a tension strap attached to each other, the "AQUILES" sock acts directly as support and protection for the Achilles tendon. By releasing the tension and enhancing the action of the tendon itself, it reduces the risk of injury to the tendon. Sizes S 36-38 M 39-41 L 42-44 XL 45-47