Ideas to protect car seats from sweat after a hike.

I'm hiking just about everyday. My back is always super sweaty and I'm worried my car is going to start to smell. I'm not a smelly person even when sweating so I do have a lot of leeway, but it will build up over time I'm sure.

I put my shirt, which comes off part way through the hike lol, behind my back between me and the seat when I remember to, but it's not super effective like the bottom is missed, and it's hard to do while I'm driving once I've already forgotten (and the sweat is already on the seat at that point)

One thought I had was seat covers and just wash them occasionally but those are so tacky I really don't like them.

Anyone have any ideas or things they've tried? Thanks in advance!