Herbal Aid Face Mask is come with the elastic bands, which make our product suitable for most sizes. This Facemask can prevent dust going through and your glasses won't fog up. The back of our product is made with white cotton cloth. Made of cotton material which is breathable and comfortable to wear. This is sewed very well to ensure the life of the product. Specification: Material: degreasing cotton. Color: black. Size: 23 * 13cm. Note: There might be a bit color distortions due to different computer resolutions. There might be size errors due to different computer resolutions.