A vehicle seat assembly includes a frame for mounting the seat to a vehicle. The seat assembly also includes a seat pad molded from a polymeric material and located proximate the frame. A trim cover is disposed over the seat pad, and includes a seam adjacent a side of the seat pad. An airbag assembly, which includes an airbag and an inflator configured to supply gas to the airbag, is also part of the seat assembly. A force concentrator covers at least a portion of the seat pad for protecting it during deployment of the airbag. The force concentrator includes inner and outer panels which form a deployment channel for the airbag, and thereby inhibit contact of the airbag with the seat pad as the airbag deploys.