An apparatus, system, and method for helping to protect occupants of a vehicle seat in the event of a collision. The vehicle seat includes a base with a bottom cushion, a backrest with a back cushion, and a side rest having a side cushion that extends upward from the bottom cushion and forward from the back cushion. The apparatus comprises a deployable restraint stored in a pre-deployment condition in the side rest. The deployable restraint comprising an airbag and an inflator for inflating and deploying the airbag. When inflated to a deployed condition the restrain cushions the occupant against impacts with the side rest.