To protect your head from the elements, 6850 Regular 2-Layer Hard Hat Liner has two layers of insulation: a cotton shell and polyester fleece lining. Outer shell is made with 100 percent cotton twill to stand up to tough environments. Fleece is soft to the touch and comfortable for all-day wear. This lightweight, thermal liner is chin-length to keep your head and ears covered. Liner fits comfortably under hard hats without adding too much bulk. Hook-and-loop closure creates a customizable fit. 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. Small pockets by ears hold regular-size hand warmers (not included). This liner is ideal for workers in cold environments. For extra face coverage, attach N-Ferno 6870, 6872 or 6874 mouthpieces (not included).