HandyStrap allows mask to hang around neck so it?s always ready for use, preventing premature disposal. Dura-Mesh?® shell protects filter media so it stays cleaner-looking longer. Shell resists collapsing, even in heat and humidity. Contour-molded nosebridge with soft foam face cushion for an easy, comfortable fit. No metal noseband to adjust and the seal is maintained without pressure points. Softspun® lining offers added comfort and durability. NIOSH certified to have a filter efficiency of 99.97% effective against non-oil based particulates. Meets heat and flame resistance in accordance with ANSI/ISEA.