Reusable T-Shirt Cloth Face Mask. Exterior Material: 95% Polyester / 5% Spandex. Interior Material: Cotton Blend. It is reusable and washable, but please be advised that this is not a medical mask and 'does not' have a slot for filter insertion. This mask is not for professional use and not medically rated, it also has no proven effectiveness against any viruses. We suggest hand washing with warm water or gently machine wash and air dry. This item is one size fits most and is perfect for yourself or to give to a loved one. Imported.