Adjustable ear straps and a built in pocket for optional filters (not included) One size fits most. Washable, Reusable, Breathable, Comfortable, Lightweight Outer and back - 100% polyester, Binding -95% polyester, 5% Spandex Not for Medical Use. These masks are not certified by the FDA to prevent illness or disease transmission. They do qualify for the CDC's recommendation for "cloth face coverings." Helps Reduce the Risk of Large Particles Expelled by the Wearer such as Spit and Mucous
