An air bladder assembly for a seat comprising is provided. A central sacral bladder has a support surface defined by an enlarged width portion connected to an elongated tapered portion, wherein the tapered portion is defined by elongated lateral sides. A pair of side iliac bladders is provided so that one of the side bladders is positioned adjacent each of the elongated sides of the central bladder. A support surface of the central air bladder is not parallel to a support surface of the side air bladders when the air bladder assembly is inflated.