As we only have car seats that allow for a thin blanket or towel, now I'm curious what obstruction these causes for some seats? I get if it s a thick(er) pad and the pad shifts but something pretty thin?
Found the above list interesting, no idea how up to date/accurate it is.
Seat Protectors At a Glance - Car Seats For The Littles
If you absolutely must use a seat protector, we’ve created this quick reference guide so you can quickly determine whether your car seat permits the use of a protector (and if so, which one), or thin towel, or nothing at all between the vehicle seat and the car seat.
csftl.org
Found the above list interesting, no idea how up to date/accurate it is.