Abstract: A protective truck bed liner incorporating a plurality of spaced rib members in the bottom, opposite sides, and front liner walls of the truck bed liner, as well as their interconnecting juncture portions, in order to substantially reinforce the walls of the liner when installed in a truck bed. The rib members in the bottom wall of the liner are also provided with alternating depressions and lands to minimize slidable movement of a load received on the bottom liner wall, particularly during movement of the truck bed in which the liner is mounted.