No matter what sport you play: If you are cold in the sensitive area of the head or sweat during intense activity, the X-BIONIC® HIGH HEADBAND 4.0 takes over the effective temperature and moisture management. The new 4.0 generation is the first to feature the Retina® ultra-high definition quality for maximum precision of functionality. The result is an ultra-dense knitted fabric in which thermoregulating functional zones are precisely integrated.