Has pocket to slide in filters
You do get a complete seal
This is my version of a face mask. You get full coverage around your head. It Velcros closed in the back so you never touch your face.
There is an inner pocket if you want to put extra filters in. This is 6 layers of fabric covering your nose and mouth. How we folded is in the pictures.
These are made from 20x20 square, 100% cotton, sewn to keep six layers of fabric in front and Velcro on back. 8 inches of adjustment. The largest size they fit I'd say is 27 inches.