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Get a performance edge when running long distances with X-SOCKS® MARATHON ENERGY. With even more patented technologies, the newly designed X-BIONIC 4.0 product generation provides the decisive impetus for outstanding performance. Innovative technologies optimally equip your feet to withstand the specific stresses of marathon running. Air-Conditioning Channel® 4.0 guides fresh air to the sole of the foot and ensures a pleasant feel-good climate. Unlike its predecessor, the channel that’s integrated into the fabric is narrower at the top and increases the airflow rate. Air Guide® technology and the Traverse AirFlow Channel System provide additional ventilation. In the perfected model of the X-BIONIC 4.0 generation, the Lambertz-Nicholson Achilles Tendon Protector 4.0 protects even more effectively against pressure, friction and impact with its shape-optimized padding structures. Suppronation® Bandage also keeps long-distance runners’ feet stabilized and ready for fatigue-free performance.