These face masks are made of 3 layers of 100% cotton with an inside pocket for adding a filter of your choice.  The masks are fitted with a dart at the nose and one at the chin.  There are 2 straps on each side to tie behind your head and neck for a perfect fit.  The masks are machine washable and dryable.  The pattern for this mask was designed by a nurse to fit over top of an N95 face mask.  These are designed for personal use and are non medical.  There are many colors to choose from.