The Mighty Well Mask’s yarn is a double knit embedded with silver ion technology to help prevent the growth of bacteria, mold and mildew on the fabric. DISCLAIMER: Mighty Well, Inc. face masks do not provide antimicrobial, antibacterial, or antiviral protection to the wearer. Mighty Well face masks have not been cleared or approved by the U.S. Food and Drug Administration (FDA) or any other governmental or administrative organization. Per CDC guidelines, cloth masks should not be placed on children under the age of 2.