Constructed with 4 way stretch 225gsm AirTech 3D-Eco™ microfleece fabric throughout, the Airblaster Pro Gaiter provides the best of both worlds. AirTech 3D-Eco microfleece has areas of high loft for maximum warmth, as well as areas of low loft to facilitate moisture transport and maximize breathability, all in a lightweight package. Warmth and breathability... the two most important boxes to check for neck gaiters. Check, check.