The lightweight Speed Evo running shirt with integrated and patented 3D Bionic Sphere System is capable of efficiently regulating body temperature. Positioned precisely in the chest region and on the upper back, this system, which is based on scientific findings, has a profound effect on the skin. The system works by cooling wearers when they sweat and warming them when they are cold. A flexible fit ensures freedom of movement. Thanks to a newly developed yarn, the shirt weighs 33 per cent less than the already multiple awarded predecessor. In addition, the kidney and pelvis areas are protected by reinforced material.