6870 Thermal Mouth Cover has two layers of insulation with a cotton shell and a polyester fleece liner to provide comfort, warmth and face protection in extremely cold work conditions. This thermal mouth cover is made to fit all N-Ferno Winter Liners (not included) to double up the warmth on those frigid jobsites. 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 mask from moving around during any task. This mouth cover is great for workers in cold environments such as those in construction, freight, drilling or mining and more. Machine-wash cover to wear the next day.