Two piece air bag with built in tether

An air bag (12) comprising:

• two pieces (10a,b) of material which when joined together defines a front face (43c), two sides (43a, 43b), a neck (48) of the air bag and also forms tether means for foreshortening of the air bag (45) upon deployment,
• wherein each piece (10a,b) of material includes a center portion (13), a first leg (14) of each piece extends to one side of the center portion, an opposite leg (16) extends oppositely from the center portion, a first side flap (18a) and an opposite second side flap (18b) extending outwardly relative to the center portion (13);
• each first side flap of each piece joined together along a first sew seam and each second flap joined together along a second sew seam, both the first and second sew seams are generally located between a respective flap and a first leg, a third seam extends generally across the center portion joining the two pieces along a line from which each opposite leg extends, each opposite leg joined at respective edges to edges of the first and second side flaps and when so joined the opposite legs and flaps form a main bag portion positioned about the first legs of each piece of material which are generally positioned facing each other, the facing first legs forming the tether means.