Trust in the thermoregulating effect of the X-Bionic Radiactor 4.0 Shirt Round Neck LG SL even in extreme cold, while enjoying the comfort of its super lightweight construction. The Decision Layer of the X-Bionic 4.0 generation offers you full functionality at a low weight. Functional zones with temperature-regulating and protective effects are precisely positioned to enhance your performance. The patented 3D Bionic Sphere System, thanks to ThermoSyphon technology, 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 faster and more efficient than ever.

• Retina Ultra-High-Definition quality
• Heat-reflecting high-tech fiber XITANIT 2.0
• Expansion Ribs cushion the joints at the elbows.