I have been struggling for a year and a half to find the right mask for me. This seems to be the perfect fit. As the other reviewers have said, it is quiet and the diffuser helps keep the air off of my spouse and me. I am a stomach sleeper and found no issues with leakage or movement. The thinner foam makes it more comfortable and I am finding that I do not over tighten my headgear straps like with the others I have tried. Reviewed by: Denise, Kansas