Anyway, in the lab test they used a medium size nasal mask - I don't know what brand or model. When I got my equipment I was given an F&P Eson (nasal) in size large. I asked about the sizing but he said that the sizes vary by brand and that the large "looked exactly right" on me.
For the most part it is working well but I do get occasional leaks when it moves around as I am a very active sleeper! I also need to use a separate chin strap because otherwise I still tend to still snore and/or experience massive air leaks from my mouth. I initially tolerated the mask much better than the chin strap but I am getting used to the strap a little better now.
In an effort to ditch the chin strap (and have a backup mask for when I get a stuffed up nose) I decided to purchase a full face mask online. I'd have gone through the DME but I asked about a second full face mask when I got the nasal mask and he said I can't get a new one for 6 months or a year - I can't remember right now. Anyway, after perusing this board and other online resources, I chose the F&P Simplus FFM in size medium. I tried it for a couple of nights but it leaked worse than the nasal mask and I couldn't seem to do much about it. So I went back to the nasal and then after watching a YouTube video on the Simplus that mentioned sizing, I thought perhaps I was wrong to get the medium so I ordered a new mask cushion in size large based on the length from my nose bridge to just below the bottom of my mouth when slightly open. The large leaked considerably worse than the medium! I knew the large would never work at all within about 10 minutes.
Now I don't mind spending the money to get extra supplies on my own, but this is looking like a complete shot in the dark and I know from reading this forum that it often takes many different masks before a person finds the right one for them. I may at some point try a small or different FF mask altogether, but for now I'd like to get the nasal mask leaking less.
So here is the main point to my post:
Again, the nasal mask is a size large. It seems to fit "right" in that the top is at the bridge of my nose and the bottom is a little above my upper lip. Side movements don't generally cause leaks, but if I move it just a little bit up (say a 1/4" - 3/8"), air leaks at the top from both sides and blows into my eyes. If I move it just a little down, air leaks near the bottom even when it is still above my lip. Based on this, I *think* that a medium size nasal mask would fit better and not leak as easily. However, as I mentioned above, trying to change sizes didn't go so well on the FFM. Tightening the headgear helps but it needs to be pretty tight and causes pain by the morning.
Any thoughts on whether or not going down a size may help with my nasal mask leaks? How small is a small in the F&P Simplus? I would say I have average or typical facial proportions and I'm about 25 pounds overweight for my height of 6'. I do not have "chiseled" facial features but am more average.