A potentially good idea! In principle the "idea" was great until I attempted to fit over mask...but it kept slipping off..so should it be made of a more "bandage quality" material , impregnated with a "grippy edge" , so that it stays on the mask and protects your face.As it stands I found it costly and ineffective...try again "Snugz mask liners"

Finding Snugz liners finally solved my… Finding Snugz liners finally solved my air leak problem after 10+ years. My snugz liner did shrink when I washed it (I did follow the washing instructions and never use hot water or hot dryer settings)

Sure makes the mask more comfortable… Sure makes the mask more comfortable and no leakage! Was having so much trouble with leakage around my eyes! Just had cataract surgery and was very irritated. This solved the problem completely.

Better fit Gave this product a long use of several months before I made up my mind. This product helped my mask fit better over the bridge of my nose and keep the top of the mask from pushing into the tear ducts of my eyes making it more effective and more comfortable fit.

Not worth the pain Though they do keep the fart noise from sounding when the mask moves, in order to still keep the mask from leaking, you pretty much have to lay in a way that the mask can't move. (Tightening the straps)This mask liner has caused deeper marks on my nose and has caused enough pain that I have had to remove it in order to use my machine. I would recommend purchasing mask liners from the mask supply company you use instead.