Ergodyne FR N-Ferno Hard Hat Liner KIT INCLUDES – N-Ferno 6882 Modacrylic/Cotton FR Winter Hard Hat Liner and N-Ferno 6872 Thermal Modacrylic/Cotton FR Mouthpiece 2-LAYER LINER + MOUTHPIECE – 60% Modacrylic / 40% cotton twill blend FR outer shell and liner FLAME-RESISTANT – Meets requirements of performance specification ASTM F1506; classified CAT2 according to NFPA 70E. Arc-rated; ATPV rating of 20 cal/cm2 LIGHTWEIGHT – Fits comfortably under a helmet or hard hat without feeling too bulky SHOULDER LENGTH DESIGN – Keeps head, ears and neck warm and covered ELASTIC FIT – Elastic gather at forehead closes the gap between liner and forehead to keep the heat in and cold out HOOK AND LOOP STRAPS – 4 evenly spaced straps included on the outside of the liner to attach to hard hat or helmet suspension OPTIONAL WARMING PACKS – Pockets by ears to hold hand warmers (sold separately) MACHINE WASHABLE California Residents: read Proposition 65 warning .