Its a long time since I contacted the Forum so please bear with me. I've been using cpap now for two years and have recently changed from a Resperonics Comfort Gel nasal mask (because of the 'dents' it was making on the bridge of my nose-no amount of adjustments seem to work) my new outfit is a Optilfe nasal pillow system ,this is working very well apart from one problem, as I have very little chin its dificult to keep it in position , I also tend to sleep on my side or rest my head on my arm. ( I know, I know but you just try and get out of the habit !!) so it tends to get pushed out of position as it only has a chin strap . I'm hoping somebody out there is having the same problem and can offer some advice.