I love my Wind Rider seat cover, it keeps air moving underneath me and keeps me off a wet seat when it's wet.
I have it on my 2020 Harley-Davidson Road Glide Limited and I do have a back rest on it , I was able to cut the Wind Rider where the back rest goes through it and have had no problems with it unraveling once I cut a slot in it to accommodate my back rest.
This is a great product, I use to use a big sheep skin to sit on but I would have to remove it when it would rain, it was big ...