To protect your head from the elements, 6860 Hard Hat Liner with FR Shell has two layers of insulation: a cotton shell and a polyester fleece lining. Outer shell is made with 60 percent modacrylic and 40 percent cotton twill with flame-resistant, self-extinguishing properties (not completely fire-resistant). Fleece is soft to the touch and comfortable for all-day wear. 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 needing head protection in cold environments. For extra face coverage, attach N-Ferno 6870, 6872 or 6874 mouthpieces (not included).