Review on Backjoy Posture Seat Pad: Ergonomic Pressure Relief, Hip & Pelvic Support for Improved Posture in Home, Office Chair, Car Seat - Core Lux Fit for M - XL Hips by Josh Nat

I bought two of these to support my hips and lower back while driving and while they aren't perfect because they fit everyone they really help a lot. Once you get used to adjusting them to sit properly in the seat, you'll immediately notice that you're sitting a little higher, which tells you how hunched you are in the driver's seat. They don't help support your natural arch in your lower back, so you still need to focus on keeping your back straight and not slouching. I will probably buy this support here as well and report back after some time in use.