HandyStrap allows mask to conveniently hang around neck so it’s always ready for use and helps prevent premature disposal. Cloth strap feels cool and comfortable against the skin. Exclusive Ventex® valve lets the hot air out faster, so workers breathe easier and stay cooler. Exclusive Dura-Mesh® shell protects the filter media so it stays cleaner-looking longer. Shell resists collapsing, even in heat and humidity so the respirator holds its shape. The 2840R95 Series has an added carbon layer to help filter out nuisance levels of ozone and organic vapors (less than OSHA PEL). The 2940R95 Series with added sorbent helps to filter nuisance levels of acid gas irritants (less than OSHA PEL). Meets heat and flame resistance in accordance with ANSI/ISEA 110-2003, Section 7.11.1.