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This lightweight X−Bionic generation 4.0 jersey is a high−tech model for ambitious runners and includes the technological advantages of ultra−high−definition Retina® fabrication. The 3D Bionic Sphere® system plays a decisive role in thermoregulation with a shape−optimized surface on the chest and an extended area on the back. The Sweat Traps® balance temperature through evaporation with precision, and the Kidney Ribs inserts dense tissue to simultaneously isolate the kidney and pelvic area. Ideo−Waistband elevated waist and Shoulder−Flex−Zone in the shoulder area keep the shirt in place and prevent skin irritations.