Adjustable cloth straps assure a snug, comfortable fit. Ventex valve lets the hot air out faster so workers breathe easier and stay cooler. Soft foam face cushion for added comfort and less pressure. Dura-Mesh shell resists collapsing in heat and humidity. Molded nose bridge seals easily without a metal noseband. Softspun lining for increased comfort and durability. NIOSH certified to have a filter efficiency of 99.97% against oil and non-oil based particulates. Made in the USA.