2840 Particulate Respirators, R95, NIOSH Certified, Large/MediumBox of 10 Added carbon layer helps filter out nuisance levels of ozone and organic vapours (less than OSHA PEL) For most welding applications where oils may be present HandyStrap with buckle allows the respirator to hang down around neck when not in use Cloth strap feels cool and comfortable against the skin Ventex valve lets the hot air out faster so workers stay cooler Dura Mesh shell resists collapsing so the respirator lasts longer Flame