Respirators feature the Moldex Dura-Mesh shell, which resists collapsing in heat and humidity. The shell is treated with flame retardants to decrease flammability. It has a molded nose bridge that seals easily without a metal nose band. The naturally contoured facepiece and Softspun lining give the respirator added comfort and durability, as well as relieve pressure points. NIOSH certified to have a filter efficiency level of 99.97% or greater against non-oil based particulates. The respirators come with the Moldex HandyStrap with buckle that allows the mask to hang down around neck when not in use. It also comes with a Ventex valve which lets the hot air out faster so workers stay cooler.