Exclusive easy-breathing wave design offers less resistance and better breatheability. 99.97% Efficient against non-oil based particulates. FlexFit® design moves easily and stays in place. Dura-Mesh® shell resists collapsing in heat and humidity. Ventex® valve lets hot air out faster so workers breathe easier and stay cooler. Soft, cloth SmartStrap® is both hangable and adjustable. Foam face cushion for added comfort and no pressure points. Softspun® lining for increased comfort and durability. Metal-free. Ideal for pharmaceutical manufacturing, battery manufacturing, welding, cutting and metal pouring. Meets heat and flame resistance in accordance with ANSI/ISEA 110-2003 Section 7.11.1.