Upcycled Seat Belt Pillow

My 14 year-old is constantly falling asleep in the worst positions in the car. We travel a couple of times a month and this makes for some very uncomfortable sleep for him. Also, sometimes he even moves the belt completely out of the way, which is very unsafe.  In an effort to solve all of that, I thought a seat belt pillow would be ideal. It's just a long, skinny pillow with thin ties that tie on to the seat belt. The long ones I've seen have been running $25, but my version was free!