A rear seat assembly is provided for supporting occupants. The seat assembly includes a seat cushion. A pair of spaced apart outer seat backs is pivotally secured to the seat cushion. A middle seat back is pivotally secured to the seat cushion and disposed between the pair of outer seat backs. Each of the pair of outer seat backs includes a pair of spaced apart bolsters pivotally hinged thereto for movement between a retracted position and a deployed position. Each of the outer seat backs also includes an actuating mechanism operatively connected between the pair of bolsters for moving the pair of bolsters between the retracted and deployed positions as one of the outer and middle seat backs pivots relative to the seat cushion.