An inflatable shoulder harness assembly for an aircraft seat including a shoulder belt, a retractor, an airbag contained within an outer cover, and a belt guide slideably receiving the inflatable airbag and outer cover therein when the shoulder belt is retracted, the belt guide defining an elongate channel for facilitating free movement of the outer cover during belt fastening and retraction. The assembly further includes an exit bezel for finishing the look of the seat and a stiffening element for preventing kinking, bunching and twisting of the outer cover.