The outer layer of our masks are treated with an antimicrobial treatment engineered to work against enveloped viruses such as influenza and human coronaviruses. While this material has been tested in Australia to be effective against 99.99% of SARS-CoV-2, testing and approval in how it is marketed varies from country to country. In the United States, the antiviral claim is currently under review. Thus, until testing is completed in the U.S. it is currently recommended that we include this disclaimer: Antimicrobial properties built in to protect the product. Product does not protect users or others against pathogens. Always clean the product thoroughly after each use. The treatment here discussed is good for at least 30 washes as per the instructions found on this page. The purpose of using an antimicrobial treated material is to add one more layer of protection. This treated material is designed to inhibit the growth of microorganisms on the surface of your mask with our two layer mask providing further protection for general public use.