The Castelli Wind Stopper Balaclava can be worn under your helmet and will keep your face warm, while allowing moisture to escape, in extreme conditions. It covers your whole head and neck, leaving an opening for your face that has high stretch. This provides you with the greatest number of options for coverage and protection against the cold.This balaclava is one-size-fits-all and suitable for both men and women. It is made from two performance fabrics that work together to ensure your comfort. The front of the balaclava is made from Windstopper® X-Fast, a light, breathable and stretchy fabric with a Gore Windstopper® membrane. This fabric is completely windproof, with a DWR treated outer surface and a cozy brushed inner surface that wicks away moisture.In addition, Castelli's own 100% polyester Warmer fabric is used, which also wicks sweat and has a thermal inner layer for extra warmth and comfort. Key features of this balaclava include:- Combination of Windstopper® X-Fast and Warmer fabrics- Windproof and moisture-wicking- Compatible with helmet- Made from 100% polyester- Covers your whole head and neckGet ready for extreme conditions with the Castelli Wind Stopper Balaclava.