The X-SOCKS® MARATHON helps you calmly face the challenges of long-distance running. You can rely on the proven X-BIONIC® quality and the optimized functions of the X-BIONIC 4.0 generation. For even more efficient ventilation, the optimized Air-Conditioning Channel® 4.0 features a precise air guidance system. CentralFlow AirCool Stripes and the Traverse AirFlow ChannelSystem further enhance the ventilation effect. The Lambertz-Nicholson Achilles tendon protector 4.0 creates a perfect protective space with its two-part padding for the friction-sensitive area above the heel. The stabilizing Suppronation® bandage additionally promotes endurance on marathon distances by supporting the foot in its rolling motion.