Soft Blue Material Is Both Lightweight And Molded In A Unique, Nosebridge Style Helps The Respirator Fit Users Better In The Nose Area And Adapts Better To Users’ Faces. Approved By NIOSH Under The New 42 CFR 84 Respirator Certification Regulations, The P100 Filter Class, As Well As For Ammonia, Organic Vapors, Chlorine, Hydrogen Chloride, Chlorine Dioxide, Sulfur Dioxide, Hydrogen Sulfide, Formaldehyde, Hydrogen Fluoride, And Methylamine Gases. Use Replacement Cartridge 817674 (Sku #: 075.9530).