The breakthrough in the development of the Radiactor EVO has been succeeded by the material experts. The strong improvement of Xitanit yarn makes the finely knitted underwear a state-of-the art-hightech-apparel. Xitanit 2.0 has 5 times more filaments as before. In this way, the surface enlarges and the efficiency of the heat reflexion to the body is improved. The result is a very thin underwear with extremely high heat backing. During the active phase, a widely inserted 3D structure supports the cooling process in breast and back areas, by evaporating the sweat directly on the skin. If sweat is absent, the structure conduces for isolation.