Although the purchasing was easy and… Although the purchasing was easy and delivery was timely I have given a 3 star rating because I think the actual product is quite average. It is soft and feels great against the skin, I have a nasal mask, but I have not been able to use it as an hour or two into sleeping it becomes very noisy and the sound wakes me and my husband. The cover would be better if it was about an inch longer so it could then fit on my mask the way it is supposed to. At the current length I cannot get it to tuck over the way it should.

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.

Difficult to get it to fit right We could not get the fabric to fit on our masks in a way that made it comfortable and prevented leaks . The fabric seemed too stiff and my husband’s large face mask just folded in weird. My smaller mask seem to fit better but leaked around the edges which kept me awake.

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.

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