Features of the Mountain Hardwear Alpine Balaclava Polartec Power Stretch is soft, durable, wicks moisture, and provides tons of warmth in. Glassketin. feature keeps glasses seamlessly integrated for a weatherproof Fit, like a good gasket Pliable brim keeps sun out eyes and falling Snow out of glasses, goggles and your vision Snug Fit for use under a hood or a helmet Flat lock construction for a seamless Fit