There is no way I would comfortably sit in this in a car for any long trips. So, I improvised and what I got was a seat-still safe, but more comfortable than it was. I had my son sit back down and he says "Oooh Comfy, Mommy!" It really is a no-brainer improvisation.......
Just get the towel folded well enough that they aren't sitting on folds or end pieces
Tuck it in real well in the back so they aren't sitting on the fold of the towel.
Doesn't interrupt the fit at all
Which seat would you want to sit on for a long car ride?