Radiactor 4.0 made of revolutionary Xitanit® 2.0. The engineered yarn it's able to reflect radiated heat inward, providing perfect temperature regulation even during the coldest of winter days. In combination with the high-tech yarn, the patented technologies inside the Radiactor® 4.0 boost your performance.Capable of regulating heat in extreme conditions. The best technologies woven into Radiactor give a boost to your performance