OccuNomix Blue 6 Ounce 100% Flame Resistant Cotton Twill Proban FR-7A Hot Rods Classic Mid-Length Winter Liner With 6.5 Ounce Modacrylic Cotton Jersey Lining, Hook And Loop Closure, Nomex Thread, Long Neck, Chin Strap, DuPont Tyvek Insulated Ear Barrier And Warming Pack Pockets OccuNomix Blue 6 Ounce 100% Flame Resistant Cotton Twill Proban FR-7A Hot Rods Classic Mid-Length Winter Liner With 6.5 Ounce Modacrylic Cotton Jersey Lining, Hook And Loop Closure, Nomex Thread, Long Neck, Chin Strap, DuPont Tyvek Insulated Ear Barrier And Warming Pack Pockets Hard Hat Liner Welding Helmet Liner Meet the Class 1 standard of the Code of Federal Regulations 16 CFR 1610 (Flammable Fabrics Act).