A restraint system for helping to protect an occupant of a vehicle having a side structure and a cabin with a seat for the occupant includes an airbag having a stored condition outboard of the occupant. The airbag is inflatable to a deployed condition positioned between the occupant and the vehicle side structure. The airbag extends in a forward-rearward direction from a first end positioned in front of the occupant to a second end positioned behind the occupant such that a torso and head of the occupant are laterally aligned with the second end when the seat is placed in a reclined position.