A seat assembly includes a frame, a seating base layer arranged on the frame and a compression limiter layer arranged on the seating base layer. The compression limiter layer includes a coil portion and a wave portion having a curved profile. The wave portion includes a plurality of wave elements and one or more ribs connected between the wave elements. The seat assembly further includes a load distribution layer connected to the compression limiter layer and an adjustment module movable between a rear position and a forward position. The adjustment module is configured to move the wave portion between a retracted position and an extended position.