I received my sleep kit for the f30i and it contained, small, medium and wide. None of these sizes seemed to work. I took another look online and saw that they also offer a small wide so on a hunch and a bit out of desperation I ordered this size. From the night I tried it I had no leaks and get 100 every night. I’m not a small guy being 6 feet and 240 pounds. I think something is off on how they named the cushion. All I know is that it works.
Rich