Abstract: A spacer for double- and multi-paned windows, e.g. insulating windows in which at least two panes of transparent material, e.g. glass, are spaced apart by a peripheral spacer so as to constitute an insulating window structure, comprises a spacer which is constituted as a frame from hollow profile members along whose both lateral outer faces the glass panes lie. The inwardly disposed profile walls are substantially planar and the interior of the frame can be filled with a drying agent capable of absorbing moisture or preventing penetration of moisture. The spacer is constituted from a plurality of extrusion-pressed profiled tubes which in the region of the frame corners are bent and are connected at least at one location, to a straight frame side along the side intermediate the bent corners, thereby reducing the sensitivity of the assembly to the penetration of moisture into the space between the panes.