Abstract: An adjustable lumbar support mechanism located in a seat back of a vehicle seat for supporting the lower back of a seat occupant. The lumbar support mechanism generally includes a lumbar support member supported on a frame within the seat back. The support member includes a sheet or panel formed of a resilient material. The panel including a plurality of openings located therein. A rib extending on the rear surface of the panel helps to control and provide rigidity to the support member. A seat occupant utilizes an actuator, coupled by an adjustment cable to the support member, to adjust the curvature and thereby vary support provided by the lumbar support mechanism.