Peacock inspired outer layer with advanced new N99 filter, reusable Vogmask N99 is the premier, designer respirator mask for high particulate matter (PM 2.5), germs, pollen, or anytime you want to filter inhaled contaminants.Excellent fit, comfort, and design, Vogmask N99 meets NIOSH filter efficiency N99 standards, inhalation / exhalation resistance, and bacterial filtering efficiency in tests by Nelson Labs.ExpirationThis product has no expiration date or the manufacturer has not provided an expiration date.