Inflatable air bag for an automotive vehicle

A side impact air bag with a self-tensioned lower edge to prevent the occupant from ejection during a rollover event or subsequent impact, A side air bag is secured to the vehicle roof rail between the front and rear pillars. A pair of tethers are secured to the air bag at a lower portion thereof and one each in turn secured to the front and rear pillars. A plurality of substantially inverted V-shaped zero length tethers extend from the lower portion to define a plurality of chambers, which when inflated cause the lower portion of the air bag to shrink and induce tension therein and to the tethers. When the side impact air bag is inflated the air bag positions itself between the occupant and vehicle window and is held in place by the tension created by the inflated sections.