Uniquely designed and versatile, the Sonic BalaclavaTM by Outdoor Research is comfortable, warm, and windproof for maximum winter protection. Mesh port allows you to breathe. Ideal for cold and windy conditions can be worn many different ways. WindStopperAR Technical Fleece is windproof and weather resistant. PolartecAR Wind ProAR with Hard FaceTM finish and soft fleece interior ear panels provide wind protection without muffling sound. Mesh breathing port allows free respiration. Contoured design creates close fit. Flat seam construction for comfort. Can be worn full coverage, under chin, venting, as a neck gaiter, or beanie. Elastane trim. Average weight: 2.5 oz. size M.