I use the F20 mask that has been mentioned. It’s extremely comfortable but the foam cushion means you can’t clean it with soap and water so it needs to be replaced sooner than other masks. Philips says every month but if you wipe it down well you can get several months use out of it.
I replace them when the foam starts to tear, which happens in the same spot every time. That’s pretty annoying. The cushion cost about $40 online so you don’t have to replace the whole mask.
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