The masks are not returnable if they are tried on and how are you supposed to know how they fit if you don't try them on? The elastic is too short and stiff and your whole face would be distorted and look prematurely wrinkled if you wear them. And then you will have an outline of the mask on your face for a long time!
Please beware the even if you didn't try on the masks, you will still have to pay $10 to return the $25 masks.