Improves the user's comfort level because the low-profile exhalation valve reduces heat build up near the face. Helps to protect from exposures to harmful particulates, such as those created during the sanding or sawing of wood, installingfiberglass insulation or sanding drywall. Approved by NIOSH as an N95 respirator, meeting the NIOSH 42 CFR 84 respirator certification regulations; tested to a 95 percent filter efficiency level.