Not a traditional leather kidney (or weight lift) belt, but I have a nice lightweight motocross back brace that provides very good support, when I needed it. And when I needed it, the backrest wasn't cutting it alone. I have not needed it in a long time though. Which is a good thing.
And it breathes: Fox racing back support. Mine is some 6-7 years old (like new), but not quite as wide as their current version. I think they may be on sale from Fox.
I was a little worried the hard exterior might rub or tear my backrest vinyl, but it didn't. Obviously, there's some get-off protection in this as well (not why I bought it).
https://www.amazon.com/Fox-Racing-Black-Belt-Kidney/dp/B005HN51BSI also have a soft rubbery velcro support (which rolls up when you wear it and is useless unless you just need heat in the lazy boy) and a suspender type brace you see the Home Depot guys wearing (for yard work), but the Fox brace was better for riding.