This shirt is equipped with the innovative CoreClimate Zone, which ensures that your core body temperature remains at an optimal 37°C. Imagine running in cool temperatures while your body stays comfortably warm without breaking a sweat. And if you do start to sweat, the HygroDiffuser with VectorSphere effectively wicks away moisture and distributes it over a larger area, creating a cooling effect. The result is unparalleled thermoregulation, allowing you to focus entirely on your run and conserve your energy. You'll feel like you could run forever without getting out of breath.