6885 FR Hard Hat Liner with Zip Off Cap keeps workers warm in cold environments with its head and neck, flame-resistant coverage. Liner meets ASTM F1506 and NFPA 70E for arc flash prevention. Made with two layers of insulation, 60 percent modacrylic and 40 percent cotton twill, this liner protects you from harsh conditions and flame-related injuries. Liner fits comfortably under hard hat 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. Buttons on sides snap into hard hat buttons to keep the liner out of your face. Zip off the cap to convert liner to a skull cap. Small pockets by ears hold regular-size hand warmers (not included).