Abstract: A foldable shade having a four-sided shape comprises an elongated, magnetic base having a section of U, a plurality of parallel slats wherein each of the odd numbered slats includes a plurality of longitudinal grooves adjacent either side, and two pairs of a plurality of projections, each pair being disposed between the grooves and the side, and each of the even numbered slats includes a plurality of longitudinal projections adjacent either side, and two pairs of a plurality of grooves, each pair being disposed between the projections and the side; and a plurality of suction cups fixedly provided at the slat farthest from the base. The slat next to the base is inserted therein. In a folded state the grooves of each of the remaining slats are inserted in the projections of the immediate next slat proximate the base.