I have been using my C-Pap for a yr. At first I had the air touch medium full mask, it left me with sore spots high up on my nose and mask marks. My supply company sent the next smaller size, had sore spots again I then tried the hybrid full mask, this mask let me raw under the nose. My supply company sent a rep out to my house and he left me with a nasal mask and nasal pillow mask. Both once again hurt me. I found myself switching masks every night and taking it off after 4 hrs and still had discomfort. I felt like the Princess and the Pea Then I found Circadiance Sleepweaver. I first bought the Advanced mask. I just could not get that mask to stop leaking by my eyes (may be user error). I thought I was going to give up the whole C-Pap thing, but I decided to try the Elan mask startup kit. The heavens opened up and the angels started to sing; the small fits wonderfully! It is very comfortable sleeping on my side or back with no air leaks, no painful spots and no mask marks. It is also quiet to boot! I now sleep through the night. I had a small issue and found that Circadiance customer service is top notch. Please follow the instructions for how to fit mask properly on your face to correct any air leakage. Thank you Sleepweaver and Sleeplay! -KF