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Trust the technologically advanced X-SOCKS® MARATHON and get ready for the challenges of long-distance running. In addition to the proven X-BIONIC® quality, the optimized functions of the X-BIONIC® 4.0 generation offer you even more comfort and safety for better stamina. The knit fabric, which precisely embeds the optimized Air-Conditioning Channel® 4.0, promotes highly efficient ventilation. The shape-optimized Lambertz-Nicholson Achilles Tendon Protector 4.0 with its two-part cushion encloses the sensitive zone above the heel to protect against pressure, impact and friction. Together with the Heel Protector, the AirFlow Ankle Pads additionally reinforce the protective space around the heel and ankle. The Narrow Arrow construction is specially tailored to conform to the anatomy of the female foot and the cuddly 3-ExpandLadiesStripes adapt perfectly to delicate feet and prevent chafing.