Ergodyne N-Ferno 6821 Winter Ski Mask Balaclava, Thermal Fleece, High Visibility, Lime HI VIS Bright lime polyester fleece with reflective accents increases visibility THERMAL COMFORT High quality polyester fleece keeps head and neck protected in cold conditions FUNCTIONAL Face mask provides protection for any cold enviroment applications or tasks ONE SIZE FITS MOST: Strechable warm polyester fleece comfortably fits most heads to provide the ultimate winter protection and comfort. LIGHTWEIGHT Fits under a helmet or hard hat without feeling too bulky