First round of prototypes made by Cynthia | Mar 31, 2020 | prototypes | 2 comments2 Comments Eileen Matthews on April 2, 2020 at 12:24 AM Is it breathable? What is the material? Cynthia on April 2, 2020 at 12:49 PM Hi, Eileen, yes, the masks are quite breathable. Three layers of fabric. Outside layer is either 100% cotton, or a cotton/polyester blend. The liner and inside layers are 100% cotton. The inside layer allows for insert of a filter of some sort, which could change breathability to some extent.