100% PVC-Free. Can be used against most welding fumes free of oil. Adjustable cloth straps assure a snug, comfortable fit. Exhale valve lets workers breathe easy and stay cool. Exclusive Dura-Meshî shell resists collapsing in heat and humidity. Softspunî liner for added comfort and durability. Meets heat and flame resistance in accordance with ANSI/ISEA 110-2003 Section 7.11.1. Fits easily under welding hoods. Soft foam nose seal for a comfortable fit.