I’m still adjusting the fit and have changed the nasal mask. My previous mask was a s/m. I started with a small, too small so I ended up with a medium. I’m still adjusting the straps. Right now I have a mark on my nose, fortunately I wear glasses. I don’t like the sound of the air passing by my ears in the tubes as it goes in and out via the exit on the top! I want the old Wisp back!!!