2800 Particulate Respirators, N95, NIOSH Certified, Large/MediumBox of 10 Added carbon layer helps filter out nuisance levels of ozone and organic vapours (less than OSHA PEL) HandyStrap cloth strap feels cool and comfortable against the skin Ventex valve lets the hot air out faster Dura Mesh shell resists collapsing Contour molded nose bridge with soft foam nose cushion provides all day comfort Meets heat and flame resistance in accordance with ANSI ISEA 110 2009 section 7. 11. 1 NIOSH approved N95