These reusable masks are made from two layers of preshrunk 100% cotton, with a pocket for an additional filter in between the layers. The ear loop elastic is left loose so you can adjust it to fit. A bendable nose piece is included and can be removed when laundering the mask. These masks are generously deep under the chin and have an encased elastic to help achieve a better seal. This allows for movement of the lower jaw - so you can talk without popping the mask off your nose! They come in sizes XS (children) through XL. Most people (men and women) fit size medium.