It's just not that noticeable, the seat pan is cutout slightly. Same seat pan
I've been flying for almost ten years now, just new fabric. I did shorten the
seat foam about 1/2" and change the shape of the cutout since my stick used to hit the seat a bit when all the way back.

Also these seats are 3" thick thick memory foam (3 x 1" layers). I'm only 5'6"
so I don't have issues hitting my head, and the foam sinks as you sit in it
anyway. The stock seats done by Knight are just plain old foam, and not
very comfortable. I had already restuffed mine with memory foam a few
years back.

I had Velour before, but I like the look, feel and toughness of the Cordura
a lot more. These are 1000D Cordura, which is the same as used for
backpacks, etc. (yes it might be flammable, but I don't care since if the
seats catch fire that's really the least of my worries ...) Cost is about $7/yd.
on Ebay. The Velour was nice for a few years, but it starts looking ratty
after a while.

Regards,
Jeff