For more speed, safety and comfort, you benefit from innovations from 20 years of experience. With the X-SOCKS® SKI CONTROL 4.0, you as a competitive athlete or ambitious recreational skier gain the decisive milliseconds of advantage. High-tech yarns and integrated patented technologies effectively protect the foot from the shin to the toes. The new Suppronation® footbed provides firm support, corrects misalignments and thus reduces the risk of injury. The innovative HelixCoil-System wraps around your calf as a concentric double helix and exerts a muscle-stabilizing effect. The ISO-Blocker also reduces point pressure on the foot. But the foot is not only well protected. It also stays dry and warm, because moisture evaporates quickly via the microfibers of the breathable MYTHLAN® yarn and the thermoactive fiber XITANIT® ensures a constant feel-good temperature. Features: STRONGER: LAMBERTZ-NICHOLSON-ACHILLES TENDON PROTECTOR 4.0. The Achilles tendon lies in the opening of the padding and is thus protected from pressure and friction. HELIXCOIL SYSTEM. Two concentric, spiral pressure struts that wrap the calf muscles from the ankle to the knee. Effective muscle support without restricting blood flow. AIR-CONDITIONING CHANNEL® 4.0. Air-conducting 3D structures and high-tech special yarns promote intensive ventilation of the feet. ISO-BLOCKER. Acts against cold bridges, reduces the risk of pressure points, ventilates and dries in the intermediate area. 100% PURE SWISS ENGINEERED. Made in Italy. 700+ international awards, 800+ patent applications for the products with the "X". Size S: 35 - 38 Size M: 39 - 41 Size L: 42 - 44 Size XL: 45 - 47