Many eyes?pattern?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.