Applications: Hot, humid and dusty environments, e.g. welding, soldering and brazing, grinding, sanding, sweeping, bagging, stone quarrying, metal machining, cement, underground mining, polishing, buffing, lime, poultry and textiles. Welding/foundry operations, lab settings, agriculture, chemical processing, printing, food processing, paint/varnish manufacturing, waste processing/sewage treatment. No oils present. Features: 100% PVC-Free®; Added carbon layer to filter nuisance levels of ozone/organic vapors (less than OSHA PEL); Can be used against most welding fumes (free of oil); Exhale valve lets workers breathe easy and stay cool; Exclusive Dura-Mesh® shell resists collapsing in heat and humidity; Molded nose bridge with soft foam nose cushion increases comfort; Facepiece is naturally contoured without pressure points; Fits under welding hoods; Meets heat and flame resistance in accordance with ANSI/ISEA 110-2003 Section 7.11.1.