Dura-Mesh shell resists collapsing in hot humid environments. Flame retardants help decrease the flammability of the shell. Softspun lining a contour molded nose bridge and a soft foam nose cushion make this mask comfortable to wear. Features an adjustable straps for a secure fit. Certified to have a filter efficiency of 99 percent or greater against particulates free of oil. For areas with an oil mist use an R or P respirator.