N-Ferno 6950 Hard Hat Winter Liner, Insulated, Sherpa Fleece Lined, Chin Length SHERPA LINING: Experience all of the benefits of a real sheeps wool to keep you warm with less bulk and faster drying INSULATED Foam insulation provides an additional layer of thermal protection for extreme cold environments ADDITIONAL WARMTH: Pockets at ears designed to hold warming packs for added warmth and comfort in extreme temperatures ELASTIC GAP CONTROL: Closed gap control between liner and forehead keeps the heat in and cold out HOOK AND LOOP STRAPS FOR SECURE ATTACHMENT: 4 evenly spaced straps included on the outside of liner to attach to hard hat or helmet suspension. Optional 6870 mouthpiece (not included) can also be attached for extra face coverage