Moldex M2800 Special Ops Series HandyStrap N95 Particulate Respirator, Handystrap (507-M2800N95) 100 EA / CAAdded carbon layer helps filter out nuisance levels of ozone and organic vapors (less than OSHA PEL) For most welding applications HandyStrap with buckle allows mask to comfortably hang around neck when not in use Ventex valve lets the hot air out faster so workers stay cooler The solid black color stays cleaner looking longer preventing pre mature disposal NIOSH approved