The N-Ferno 6874 Thermal Mouthpiece has 2 layers of insulation with a neoprene shell and a fleece liner to provide comfort, warmth and face protection in extremely cold weather work conditions. This thermal winter face mask is made to fit most N-Ferno Winter Liners (liners sold separately) to double up the warmth on those extra-frigid jobsites. The water-resistant, 1mm neoprene is warm and breathable while remaining soft and stretchy for a close, heat-trapping fit. Polyester fleece li