I tried something like this for my office chair. It was fine as a seat, but it raised my overall position on the chair vs the backrest and i ended up throwing out my back from the resulting offset. So, mind the chair you intend to use it on.

https://a.co/d/2quCJmP This is the one my ex hubby has and he swore by it. Took it on road trips for long drives too. Half of the price.

That looks comfy, and I like the cutout for the coccyx.

Do you need something specialized?

My gaming chair, while comfortable, is woefully under cushioned. I actually bought the exact cushion labs product in the picture and have spent many a long day sitting on it gaming away without any complaints besides it occasionally shifts on the chair. One of these days, I’ll upgrade to a better chair, but in the meantime, this was a quick, easy solution that has worked well for the last two years now.

I have something that looks like that my flat ass needs in my Tacoma. It’s amazing