Trust in the thermoregulating effect of the X-Bionic Radiactor 4.0 Pants even in extreme cold, while enjoying the unparalleled comfort of their super lightweight construction. This Decision Layer is made from an ultra-dense knit with reduced volume, providing full functionality at a pleasantly low weight. Functional zones with temperature-balancing and protective effects are precisely positioned to enhance your performance. The highly effective temperature-regulating effect on cold winter days is thanks to a heat-reflecting high-tech fiber. The patented 3D Bionic Sphere System, enhanced by ThermoSyphons technology, is stronger than ever and further supports highly adaptive thermoregulation: complex 3D structures and Y-shaped elements maximize air exchange, cooling when you sweat and warming when you freeze – now even faster. Retina Ultra-High-Definition quality.