Features 100% PVC-Free. Can be used against most welding fumes. Exhale valve lets workers breathe easy and stay cool. Exclusive Dura-Meshî shell resists collapsing in heat and humidity. Softspunî liner for increased comfort and durability. Meets heat and flame resistance in accordance with ANSI/ISEA 110-2003 Section 7.11.1. Molded nose bridge with soft foam nose cushion. Facepiece is naturally contoured without pressure points. Straps are securely attached so they dont break at the seal.