Abstract: A rear window assembly for a pick-up truck. A slidable window panel is provided between first and second fixed window panels. In order to open the slidable window panel, at least a portion thereof is popped outwardly and thereafter the panel is slid along at least first and second tracks to an open position. In certain embodiments, opaque layer(s) may be provided on an exterior surface of the slidable panel in order to hide from view support arm(s) or the like utilized for supporting the slidable panel as it is slid to its open/closed position. Moreover, in certain embodiments tracks are located on the inboard side of the slidable panel in locations so as to be at least partially hidden from view. A power opening/closing system for the window is provided in certain embodiments. A spring-biased window closing system is provided in certain embodiments.