Made with double layers, so a filter can be placed between layers for additional safety. Fabric is modal jersey knit, an all-natural fiber made from beechwood trees. It feels soft and smooth against your skin. The Rhodium chain never tarnishes and plating never rubs off. The Black Onyx precious stone offers both style and spiritual protection. Easily add hair pins for added stability. This can be worn over your mouth and nose or pulled down and used as a fashionable collar. Additional options for chain includes thin orange or bronze chain. Chain is strong and non-tarnish with antique ornate paisley charm.