@ecook The most important things to remember while choosing a mask and headgear: Get a headgear with a plastic frame that holds the mask securely in place. The elastic-only headgears just don't stabilize the mask. ResMed makes on, I use it. Second, the smaller the mask you are comfortable with, the better. Third, if you do not have a rather long nose with nose cavity that is open a good distance up inside the nose, don't use the nasal pillows. I tried them, and got horrible sores inside my nose, with infections which were most difficult to stop.