Antibacteria cloth mask, 3 layers - Outer layer: features strong water resistance (Prevent droplets clinging to masks, limited Viral infection, common cloth does not have this possibility). - The middle layer: has a filter function (air filter, dust and other agents entering the nose and mouth). - Inner layer: has 99.9% antibacterial properties (Preventing bacteria from entering). - All Dony Masks are safely sterilized by E.O gas before reaching consumers. - Ethylene oxide gas has ability to penetrate the tiniest of pathways and destroy bacterial & virus. It can be used in sterilizing a wide variation of materials such as: mask, work wear uniform and medical devices. - With E.O gas sterilizing in the final packaging; DONY MASK is ready to wear directly after taking out packaging; and still ensure good hygiene, no virus or bacterial infection from the 1st. Wasable 30 times OEM orders are welcome Advantages of Dony Face Mask: Packed in specialized packaging and sterilized by E.O technology for medical use Designed to fit, hug your face, breathable Antimicrobial rate of raw fabric reaches 99.9% that tested by Intertek Products manufactured directly in Vietnam, expiry date up to 3 years