A vehicle interior includes a floor, an airbag supported by the floor and being inflatable away from the floor to an inflated position. The airbag includes an outer panel, an inner panel, and an inflation chamber defined between the inner panel and the outer panel. In the inflated position, the outer panel and the inner panel extend along a curved path about an axis transverse to the floor. During a vehicle impact, the airbag may be inflated to the inflated position to absorb energy from an occupant of the vehicle.