The present invention is an article or device to facilitate the heating of rounded vessels and other rounded objects comprising a flexible polymeric support having a plurality of folds so as to form the flexible polymeric support into a plurality of nested, concentric hollow cylindrical portions whose respective upper edges can be arranged and fixed into two or more configurations to accommodate at least two respective spherical section contours of respective different sizes. The present invention facilitates the heating of rounded, regularly-shaped or irregularly-shaped vessels or objects by presenting a flexible polymeric support surface. The flexible polymeric support surface is sufficiently malleable so as to be adapted for heating such objects or containers, and may be incorporated into an arrangement or system for heating such a container or object, and/or for stirring its contents, while being supported by the article or device of the present invention.