Livtribe Car Seat Cushion - Memory Foam Seat Pad for Sciatica & Lower Back Pain Relief - Driving Cushion with Breathable Mesh Cover - Road Trip Essentials for Drivers (3D Gray)

Definitely try a regular throw pillow first to see if it makes a difference for you. This is the wedge pillow I ended up getting and I’m very satisfied with it. It has straps to connect to a car seat if you want (I don’t) but you could also put a string to it and tie it to your seat if that’s something you want. https://a.co/d/07sF1cPG