NIOSH N95 approved with inner foam provides a custom seal. while reducing the wearer’s risk of inhaling hazardous airborne particles, including dust particles. Protects by filtering particles out of the air as you breathe.. NlOSH N95 approved Inner foam provides a custom seal Yellow color-coded double straps Exhale valve for more comfortable breathing HY9812 is metal-free HY8812 has metal nosepiece Medium/Large size How to Properly Put on and Take off a Disposable Respirator: https://www.cdc.gov/niosh/docs/2010-133/pdfs/2010-133.pdf