Abstract: A composite molding structure having transverse flexibility for forming curved architectural moldings and display enclosures comprises a plurality of elongate, flexible elements slidably interconnected in side by side relation with their longitudinal axes lying parallel to each other. Each element has a pair of flanges extending from opposite sides of a longitudinally extending web portion, the flanges defining together with the web portion a longitudinally extending channel conforming to the cross-sectional configuration of a flange of an adjacent element. The flange is keyed into the channel and is slidable therein upon transverse flexing of the assembled molding structure.