A vehicle seat assembly according to the present disclosure includes an air bag module having a front and a side, and the air bag module includes an inflatable air bag and a rigid cover at least partially covering the air bag. The rigid cover may include a protection portion that extends at least partially along the side of the air bag module. The protection portion has an end spaced away from the front of the air bag module. The seat assembly further includes a seat pad disposed outside of the air bag module, and a trim cover positioned over the seat pad. In at least one embodiment, upon inflation of the air bag, the end of the protection portion is configured to move forwardly such that the protection portion extends between the seat pad and the air bag.