Whether on a hard night's descent, a snowshoe tour or a demanding cross-country skiing session: the X-BIONIC® SOMA CAP LIGHT 4.0 hat is comfort without temperature restrictions. Ultra-high definition Retina® fabrication: functional zones are positioned with pinpoint precision. Legendary and patented 3D Bionic Sphere® system, allows adaptive thermoregulation by cooling when sweating and heating when cold. Sweat Traps® trap sweat before it begins to flow and support temperature balance through selective evaporation. At the temples, the AirConditioning Zone absorbs excess moisture and allows it to evaporate outside.