Fiberglass Reinforced Polymer (FRP) upper and lower skins higher rigidity over older materials. Fiberglass Reinforced Polymer (FRP) provides improved scratch resistance when compared to aluminum or fiberglass. Fiberglass Reinforced Polymer (FRP) also has higher impact resistance (Approximately 20KJ/m2).Polypropylene (PP) Honeycomb core creates a stronger load bearing structure while reducing weight. 350lbs Surface load bearing capacity a significant improvement (Up to 200lbs) when compared to older design and materials (Aluminum and Fiberglass). Slim design (under one inch) allows for maximum under tonneu storage capacity when compared to other hard shell designs. Easy to Install With Included Clamps. Might Minor Drilling Required to Attach Fittings. Increases Trucks Aerodynamics at Speed. Keeps Truck Bed Dry and Secure. Adjustable Tension for the Perfect Fit. Locking Strap to Secure Cover while Folded Up and Driving. 2015 2016 2017 2018 2019 Ford F150 with 5.5Ft 66 Short Bed.