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Optimize runner energy management with the unique patented THE TRICK® technology. Revolutionize your thermoregulation by activating sweat production before you start to overheat so you can train, compete and stay constantly active at your optimal body temperature. The energy released by the earliest start of evaporative cooling flows directly into your running performance. Your run will be very comfortable thanks to the Collar Construction and Flexor sleeves. ThermoSyphon® System, the next generation of the legendary and patented 3D Bionic Sphere® system, optimizes the thermoregulatory management of your skin. Made with ultra−high definition quality Retina® technology.