the invention is a truck bed cover made from thermoplastic material . the top of the truck bed cover has a relatively smooth appearance . the underside of the bed cover comprises a support structure utilizing at least one “ x ”- type support . in the preferred embodiment , four “ x ”- type supports are utilized . a typical bed cover typically weighs less than 75 pounds for greater ease of handling , without loss of structural support strength over fiberglass covers from loads placed on the top of the bed cover .