Depending on what you are looking for the best quality seat covers are custom made ones from fabrics that breath. Canvas / Poly Cotton / Neoprene most of these fabric breath are shouldn't be a problem for your seats
Do seat covers ruin leather seats?
No, as long as the fabric breathes and doesn't make the leather sweat you should be good to put them on
Which is better leather or cloth car seats?
Leather will always last longer than cloth but of course this comes at a cost as well. A Lot of people that get cloth always buy seat covers to help protect them
