The Sierra facemask gets an upgrade for the 22/23 winter season with TurboWick technology. Utilising biomimicry, this revolutionary fabric allows moisture to flow through the fabric in one direction in the same way that tree roots transport water, via a capillary function. The result is the most breathable and moisture-wicking fabric every implemented into a facemask. Sweat and vapour molecules from your skin and breath flow effortlessly through the fabric to keep you dry and warm all day long, while the tight weave construction means that snow and cold air don't ingress from outside. Say hello to the future of winter facemasks, and goodbye to ice build-up and goggle fog. Made from 260gsm 85% recycled polyester, 15% spandex. Bluesign® approved.