A sun visor assembly for an automotive vehicle includes a sun visor panel having generally planar opposing sides sandwiched together to define a pocket therebetween. A longitudinally extending support rod is positioned between the opposing sides of the panel for supporting the panel in the interior of the vehicle. An adjustment mechanism is coupled between the support rod and the sun visor panel for providing selective sliding movement of the sun visor panel along the support rod between a retracted position and an extended position. The adjustment mechanism includes a support frame secured to the visor panel having an upper rail forming a longitudinal rack, a guide carriage secured to the support rod and slidably coupled to the support frame, and a gear rotatably supported by the carriage and meshed with the rack for guiding the sun visor panel along the support rod between the retracted and extended positions.