– Material: Non-woven Spunbonded polypropylene + Melt BlownPolypropylene – Anti-fog: With a concealed plastic nose built-in hidden cartilage bridge, it can be adjusted to avoid voids and reduce the inhalation of harmful substances. – The decompression valve makes exhaling easier. – High filtration: The inner layer of activated carbon can filter harmful gases or odors. This product ships immediately via USPS PRIORITY MAIL. DO NOT USE MORE THAN 7 CONSECUTIVE DAYS.