NIOSH/MSHA (National Institute for Occupational Safety and Health/Mine Safety and Health Administration) approved. Use for certain paint spraying, solvents and pesticides. Comfortable, lightweight, medium-sized easy-to-adjust. Low maintenance - only cartridge and prefilter to replace. Easy-to-clean between uses. Low profile improves visibility and accommodates safety glasses. Cool Flow exhalation valve opens easier making breathing easier, helps reduce heat and moisture build-up in face piece, and helps provide cool, dry comfort. Replacement filter cartridge available.