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The X-SOCKS® MARATHON helps you feel relaxed as you confront 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. The optimized Air-Conditioning Channel® 4.0 with its precise air duct system provides even more efficient ventilation. CentralFlow AirCool Stripes and the Traverse AirFlow ChannelSystem further enhance the ventilating effect. The Lambertz-Nicholson Achilles Tendon Protector 4.0 with its two-part padding forms a perfect protective space for the friction-sensitive zone above the heel and works together with the AirFlow Ankle Pads and Heel Protector to prevent injuries caused by pressure and friction. The stabilizing Suppronation® Bandage further boosts your endurance on marathon courses by supporting your foot in its rolling motion.