the full-face liners for res-med do the job of protecting your face, but, sometimes, if the liners aren't positioned properly You wake up with a line on your cheek. It does happen to Me sometimes,
It may be something to think about, placing a small sticky dot on two sides and top and bottom of mask to have the liner stay on and positioned correctly.
This may not be possibe though.
The mail we get is paper with sticky glue, but, on the rubber mask, It may not be able to stick to anything. Just a thought.
Gail