Headrests are coaster car accessories They are supposed to address some safety concern, but I honestly don't know what They are rubber coated devices put on the backs of each seat and succeed at blocking one's view of the ride
A headrest is the part of the back of a seat on which you can lean your head, especially one on the front seat of a car. the top part of a chair or of a seat in a car, plane etc that supports the back of your head