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The EFFEKTOR® 4.0 RUN Shirt maximizes your running performance with all the new generation novelties. ThermoSyphon® system, the next generation of the legendary patented 3D Bionic Sphere® system. Its complex 3D structure of internal and external air channels whose thermodynamics improve the skin's climate. ThermoSyphon® cools when you sweat and heats up when you're cold. Maximizes thermoregulation and increases its performance. Partialkompression® reduces muscle vibration, improves the supply of oxygen and nutrients to the muscles and allows faster regeneration, all without neglecting the cooling of the skin. This product is manufactured using ultra−high resolution Retina® technology.