Copper is well-known for its ability to stop and kill the growth of bacteria and other infectious pathogens. It is infused into threads of fabric and will never wash out. The copper element is embedded into its fibers tto utilize copper’s odor-fighting properties.Copper releases positive ions that attach to the negative ions of bacteria, which prevents the growth of odor-causing bacteria. This unique fabric structure is sweat-wicking and quick-dry, helping to regulate temperature within the mask.