Abstract: A multi-piece liner is disclosed for snap-in attachment and securement to the bed of an open-bodied truck. The liner includes at least a right-side panel, a left-side panel, and a cab-back panel, and may also include a tailgate panel and a floor panel. The side panels are generally C-shaped and constructed and arranged to fit between the in-turned upper edge of the truck body and the floor of the truck body, to be held in place by compression-retention and including flanges on the cab-back panel which rest behind portions of the right and left panels to hold the cab-back panel in place. The floor panel may include tubes and the cab-back panel may include notches which permit fluid to drain from the upper surface of the floor mat and also which includes ribs beneath the floor mat to space the floor mat from the bottom of the truck body. The bed liner may also include a two-piece tailgate panel, one piece having a curved edge which fits over the top of the tailgate.