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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 oxygen and nutrient delivery and enables faster regeneration. Made with ultra-high resolution Retina® technology. Zip on neck. Cushioning areas on shoulders. Waterproof pocket.