To protect your head and neck from the elements, the 6877 Shoulder 3-Layer Hard Hat Liner with FR Shell has three layers of insulation: fire-resistant shell, foam mid-layer and polyester fleece lining. Shoulder-length outer shell is made with 60 percent modacrylic and 40 percent cotton twill with flame-resistant, self-extinguishing properties (not completely fire-resistant). Polyester fleece is soft to the touch and comfortable for all-day wear. Liner fits comfortably under hard hats without bulking. Foam insulation provides an additional layer of thermal protection. 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 so cold stays out. Small pockets by ears hold regular-size hand warmers (not included). For extra face coverage, attach N-Ferno 6870, 6872 or 6874 mouth covers (not included).