A seat assembly for a vehicle includes a seat frame. The seat assembly includes an armrest. A hinge pivotally connects the armrest to the seat frame. The armrest includes an upper extension extending upwardly from the hinge and a lower extension extending downwardly from the hinge. The seat assembly includes a deformable member between the seat frame and the lower extension of the armrest. The deformable member is deformable relative to the seat frame and the armrest.