A vehicle seat assembly includes a seat surface. The plurality of polymer cushions are respectively included in the memory metal, and the first side of the supporting structure which is operatively connected to the bottom and the second side of the adjacent seat surface. The power source is operatively connected to each polymer pad in the memory metal and is configured to provide energy for a plurality of memory metals in each polymer pad. The controller is communicating with a plurality of polymer pads and configured to transfer a predetermined electric input to the memory metal of each polymer pad. The predetermined electrical input is operated to the deformation state of each polymer pad, resulting in a plurality of comfortable position between the cushion. The air bag is arranged below the plurality of polymer pads. The air bag can be operated between the aeration and the bleeding state.