Ergodyne N-Ferno 6890 Fire Resistant Insulated Thermal Hard Hat Winter Liner, Black Fire-Rated (FR) Compliant -Meets requirements of Performance Specification ASTM F1506; classified CAT2 according to NFPA 70E Thermal Warmth- made with soft modacrylic fleece Warm Ears- pockets hold warming packets for additional warmth Hook & Loop Straps- securely attach to hard hat suspension or inside helmet for a comfortable fit Optional 6872 mouthpiece (not included) for extra face coverage