Our 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. You can also replace the elastic with something more comfortable for you. 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.