Cloth HandyStrap[R] allows mask to hang down loosely and comfortably and feels cool around the user's neck when not in use. Added carbon layer helps filter out nuisance levels of ozone and organic vapors (less than OSHA PEL). Can be used against most welding fumes. Fits easily under welding hoods. Ventex[R] valve lets the hot air out faster so workers breathe easier and stay cooler. Soft foam nose cushion for added comfort and no pressure points.