Made with 100 percent cotton twill and 100 percent polyester fleece lining, this 6871 2 Layer Hard Hat Liner with Mouth Cover Kit keeps workers warm in cold environments with its full-face coverage. Shell design prevents mouth cover 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. Liner fits comfortably under hard hats without adding too much bulk. Hook-and-loop closure has a secure fit to prevent the cover from moving around during any task. Attach four exterior, hook-and-loop closures to the interior of a hard hat for extra security and warmth. Elastic strip on the forehead area keeps the liner snug against the face to trap body heat and keeps cold out. This liner is ideal for workers in cold environments and wear head protection such as construction, freight, drilling or mining and more. Use liner while skiing, snowboarding or sledding as well.