An airbag assembly includes an airbag and a system provided in contact with at least a portion of the airbag that includes a first member and a second member. The second member at least partially overlaps the first member and is held in contact during initial deployment of the airbag with the first member by a frictional force between the first member and the second member. The system is configured to cause the airbag to inflate laterally with respect to a vehicle occupant until the frictional force is overcome by inflation of the airbag.