Seat cushions/pad for a 2,500 mile classic car road trip

Looking for AIS (Ass In Seat) experience for a portable seat cushion/ pad to add comfort for a long road trip. (‘68 Polara)
My seats are newly restored/rebuilt pretty close to how they would have come from the factory. However I did take the liberty of adding a little more lumbar support, so for 200 mile trips they are not bad. The downside is the vinyl on warm driving days.
I can google and find sites that offer these, but I am after some AIS testimonials. I have a bench seat and no...

Seat cushions/pad for a 2,500 mile classic car road trip
Author: HWYCRZR