Industrial Half Face Mask- 550030M NIOSH/OSHA/EN136:1988/CLASS 1 Converts to PAPR (Supplied Air Respiration) Lower Headstrap Stretchers & Moves with the Worker for Comfort Wide Contoured Sealing Area Provides Great Fit Low Dead Air Space Limits Re-breathing of Exhaled Air for Increase Worker Productivity Polypropylene Cartridge Connectors Thermoplastic Elastomer (TPE) Facepiece Material Nylon-Woven-Elastic- Latex Free Headstrap Medium Size