The Ergodyne N-Ferno 6874 Thermal Mouthpiece with 2-Layers has double the insulation with a neoprene shell and a fleece liner to provide comfort, warmth, and face protection in extremely cold weather conditions. This thermal winter face mask is made to fit most N-Ferno winter liners and will double up the warmth on those extra-frigid job sites. The water-resistant, 1 mm neoprene is warm and breathable while remaining soft and stretchy for a close, heat-trapping fit. Polyester fleece lines the inside of the thermal winter face mask for comfort against the skin, long wear, and optimal breathability. The shell design prevents the mask from being sucked into the mouth for plenty of breathing space and protection from the cold air. The detachable thermal winter face mask allows you to let in air or remove it for speaking when needed. The adjustable hook and loop closure have a secure and adjustable fit to prevent the mask from moving around during any task.