Thanks for your review.
I've bought this twice. First time was at least 5 years ago; maybe longer.
And I bought it recently.
First, I find the seller's size description confusing. There are now two sizes. I bought a Small this time. (My hat size is 7-1/2 if that helps.)
Second, there is a velcro closer at the back. If I don't put the hat on tight like a second skin, the strap pulls the cap down in front. It gets hard to see! :
And if i get up in the night and take the mask and hat off, Im toast. I MUST put the mask back on without the hat, and that requires sleepy attempts to adjust the headgear right.
Third, setup. PaulaO2 is right. Putting the mask on over the CPAP cap is not easy. It's not fun.
Would I buy it again? Yes. The owner of the firm is really helpful. This is a good product.
Normal chinstaps don't work for me. I have a collection of bad-chinstraps.