100% PVC-Free. Meets CDC guidelines for protection against TB. NIOSH certified to have a filter efficiency of 95% or greater against non-oil based particulates. Dura-Mesh shell resists collapsing in regular use and even under hot and humid conditions. Contour molded nose bridge for extra comfort. Soft foam nose cushion for an easy and comfortable fit. The softspun inner lining is soft to the touch. Fluid resistant. Bacterial filter efficiency >99.9%. Highest ASTM level of fluid resistance (160 mm Hg).