To provide comfort, warmth and face protection in extremely cold work conditions, 6874 Thermal Mouthpiece has two layers of insulation: a neoprene shell and fleece liner. This thermal mouth cover is made to fit all N-Ferno Winter Liners (liners not included) to double up the warmth on those frigid jobsites. Water-resistant, 1mm neoprene is warm and breathable while remaining soft and stretchy for a close, heat-trapping fit. Shell design prevents the mask from being sucked into the mouth for plenty of breathing space and protection from the cold air. Easily remove detachable mouth cover when needing air or to talk. Adjustable hook-and-loop closure has a secure fit to prevent the cover from moving around during any task. This mouth cover is great for workers in cold environments such as construction, freight, drilling or mining. Use cover while skiing, snowboarding or sledding as well.