This comfortable, reusable and machine washable fabric mask is a great way to help protect against allergens, germs and pollution as well as the common cold, seasonal allergies, and breathing in smog. You can even use it as a room-darkening sleep mask to help improve the quantity and quality of your sleep. Adjustable stretch ear loops provide a perfect fit, and it has a pocket inside for an optional carbon filter (#55330 sold separately). Machine wash. Polyester and spandex. One size fits most. Measures 7 1/4"L x 5"W. This item is not returnable.