Usually, I find the 2019 Bolt seats to be fine for up to an hour. But after that, it just isn't enough, and I find myself shifting around trying to get comfortable. A while ago I bought a Purple Simply Seat cushion for general use, and on my last 4-hour round trip I decided to try it in the car. It doesn't make the seat any bigger, but wow!, what a difference! The seat bottom felt luxuriously comfortable, and my butt was happy the whole trip. It is 1" think so it does make me sit a bit higher, but there's still copious headroom. I only had to readjust the mirror a bit. I think an even thinner pad would do the trick. I won't be using for everyday driving, but it's definitely going with me on any trip. I got mine directly from the Purple store, but one of the Asian knockoffs might work just as well.
Best Car Seat Cushion 2020 | Purple®