AIRBAG ASSEMBLY INCLUDING RETRACTABLE TETHERS

An assembly includes a seat including a seatback. An airbag is supported by the seatback and is inflatable to an inflated position. A tether is connected to the airbag. A pyrotechnic device is supported by the seat and connected to the tether. As the airbag inflates to the inflated position, the pyrotechnic device pulls the tether to position the airbag.