Fiberglass Reinforced Polymer Panel Top Skin; Made In The USA; Compatible With BAKBox2; 2-Year Warranty; Drive With Cover In Closed/Folded Or Flipped Up Position; Patented Rail Design w/Load-Bearing Flange; Supports Heavy Loads; EPDM Outer Rail Seals For Maximum Water Resistance; UV Resistant For Long-Term Durability; 100% Truck Bed Access; Automatic Latching System/Locks With Tailgate; Weight Rated Up To 300lbs Of Evenly Distributed Weight