A sound blocking rear seat assembly for an automotive vehicle. The rear seat assembly includes a seat back adjacent to a seat bottom. The seat bottom also defines at least two passenger seating locations. A seat base of the seat bottom extends the width of the seat assembly and has a non-planar three dimensional contoured upper surface. A nonporous resilient sound blocking layer has a shape substantially conforming to the upper surface of the seat base and is located over the seat base such that it extends substantially continuously and uninterruptedly over the width of the seat assembly. Positioned over the sound blocking layer is a resilient seat cushion, and a trim layer is located over the seat cushion layer.