These masks are made with a single layer of organic cotton flannel. The fabric is pre-shrunk, but may still shrink with washing. If you are concerned about shrinkage hang or lie flat to dry. I experimented with a lot of different ways to make masks. I followed the CDC recommendations. These are only one layer, for situations where you out in the open and/or are able to distance yourself well from other people. Or to add as another layer to another mask. he elastic is very soft underwear elastic that was used in making CottonField women's panties. Since the owner has retired and the undies are no longer in production, the former owner gave me sever rolls of this elastic. It's very nice and soft on the ears. They measure approximately 6" x 7.5". I have only 2 of these available. I only made a few in this style. I will list some more styles, and I may continue to work on more designs. I used contrasting thread on these, and some of the others, to make the plain, undyed, unbleached fabric a little more interesting. The shade of the fabric varies depending on when the cotton was grown. The hotter the weather, the lighter the fibers. This flannel is almost white.