HandyStrap allows mask to hang around neck so itÕs 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 110-2003, Section 7.11.1.