A headrest for an automotive seat which comprises a head contact portion, a stretchable rear portion which includes an elastic webbing, and an air bag disposed within those two portions, all of them being fixed upon the top of seat back of the seat. The expansion or shrivelling of the air bag, by using...http://www.google.fr/patents/US4865388?utm_source=gb-gplus-shareBrevet US4865388 - Headrest for automotive seat
