Abstract: A heated mat structure provides a plurality of thin heated mats, each releasably interconnected in electrical parallel through an electrical powering system providing low voltage current. Each heated mat comprises relatively thin rectilinear laminated structure, having a rigid back panel with fastening means for positional maintenance, supporting a thin heating lamina having an element formed of electrically resistive metallic foil imbedded in plastic sheet material which in turn supports an outer surfacing lamina having an exposed surface of high friction material to prevent slipping. The laminae may carry plastic sheet material between adjacent surfaces and about peripheral edges to aid interconnection and isolation. All adjacent structural surfaces are mechanically joined. Each pad provides an electrical connector communicating spacedly from interconnection with its foil heating element.