There is a low hanging object there.

So this rather uncomfortable looking pillow is designed to attach to a low hanging oil pan to prevent people from bumping their head badly should they not be watching out for low hanging objects. The flap with grommets is the part that ties to the oil pan. The grommet in the center designed to help let out air should someone actually hit it. There is a piece of foam in this that is more than two inches thick. The yellow color was chosen to help draw attention to the fact that there is a low hanging object in front of you.