Exclusive easy-breathing wave design is 95% efficient against oil and non-oil based particulates. FlexFit® design moves easily and stays in place. Dura-Mesh® shell resists collapsing in heat and humidity. Soft, cloth SmartStrap® is both hangable and adjustable. Foam face cushion for added comfort and no pressure points. Metal-free. Ideal for pharmaceutical manufacturing, petrochemical manufacturing, dry chemical handling, conventional and nuclear power generation, and paper processing. Meets heat and flame resistance in accordance with ANSI/ISEA 110-2003 Section 7.11.1.