This custom cloth face mask is complete with a disposable mask insert slot. The slot allows you to insert a disposable mask (sold separately) inside to provide extra layers of filter protection. Reusable. Machine washable. Comfortable 100% polyester fabric. Sturdy over-the-ear elastic straps for a snug fit. One Adult size fits most (7" x 3.5") to cover your nose and mouth. Please note that our face masks have not been tested for flame resistance or skin sensitivity.