Product description What is the YTFAIFEN N99 Cotton Mask? Lab tested British military filtration technology filters almost 100% of pollution, gases, odors, dust, pollen, smog in YTFAIFEN friendly mask suitable for the whole family. Whether you wear it when you\'re sick or while traveling to locations known, these N99 respirator masks can keep your better Health. The YTFAIFEN cotton masks can be worn by men, women and children. Test Performance: 99.53% average filtration of smog,dust,pollution. 99.66% average filtration of Toxic microorganism. 99.63% average particulate filtration down to 0.3 microns. Special Care: The mouth mask can be washed to be used over and over again, But the filter can\'t be washed. If you want to wash the mouth mask please remove the filter. If you wear it 1-3 hours a day, it is recommended to replace the filter once a month, If you use it for less than 1 hour a day, it is recommended to replace the filter every 45 days. Package Including: 1 Mask + 2 Filters. IMPORTANT! · Please note that there may be a slight discrepancy between size measurements and actual product, the size as the standard size, can suit for most people, maybe not fit few one. · The color of the item might appear slightly different because of different screen display settings. · In no event shall we be liable for any direct, indirect, punitive, incidental, or consequential damages arising out of or associated with the use or misuse of the product featured. 5 star please Any unclear or displeasure, contact us on time and not leave the negative reviews please, we will try best to solve your problem, thank you for your cooperation!