A seat assembly is provided with a seat bottom and a seat back mounted adjacent the bottom. The seat back and seat bottom are provided with an occupant seating surface. At least one air bladder is oriented in a sacral region the seat bottom or the seat back. The air bladder has a support surface defined by a enlarged width portion and extends to an elongated tapered portion. When the air bladder is inflated, the support surface is inclined from the taper portion to the enlarged width portion relative to the seating surface.