Don't let hot days keep you from your favorite sport and protect yourself with the X-BIONIC® FENNEC 4.0 HEADBAND WITH VISOR against high temperatures. The new 4.0 generation is the first to offer Retina® Ultra-High-Definition quality for the highest functional precision. The result is an ultra-dense knit with thermoregulating functional zones precisely integrated. Additionally, the highly elastic band adapts to any head shape and guarantees optimal wearing comfort.