I have a full face mask and while it… I have a full face mask and while it did stop the noisy air leaks, a side affect of breathing through my mouth all night with the leak was that my gums seemed to dehydrate and cause a lot of pain in my teeth. I gave up on the third night, too painful

You issued my refund quickly. You issued my refund quickly, I mean faster than most. This tells me you are mindful of my needs and respect them. Now if you could engineer a cover for all other masks I would buy them without hesitation. Thank you for being part of the solution.

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.

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.

The mask is a great idea but… The mask is a great idea but unfortunately, using the liner distorted the shape of the membrane that creates a seal on the face. The result was a unacceptably high level of air leakage even at relatively low levels of air pressure. It may work more effectively with other mask designs but not for AirFit F20 size M. YMMV.