Cotton mask measures 11” across and 7” from nose to chin. The back is lined and has an opening to insert a filter. You can even slide a piece of wire in to help it contour your nose. Just make sure you take it out before washing. Speaking of washing, the masks are preshrunk cotton. You can wash them on hot in a mesh bag. Hanging it to dry is best. If you must iron it avoid the elastic at all costs! It will melt!!! The default for the elastic is to go around your ears. If you need to wear them for extended periods and would like it around your head instead just send us a message!
PS don’t microwave it. Someone says that sterilizes it. It will catch fire. You can’t be doing that.