UnderCover tonneaus are made from a very selective composite of ABS plastics and polymers. Unlike other plastic aftermarket accessories, the UnderCover is constructed to prevent warping from direct sunlight. At an average of 58lbs, UnderCover is also the one of the lightest hard tonneau covers on the market. There are two very important points that make UnderCover far superior to a Fiberglass cover. First, is its light weight, which makes UnderCover very easy to remove and install. With our no-drill hardware, putting it on and taking it off is a breeze. Second, all of our covers come with wall mount hardware. Once you do take our cover off you can easily store it by hanging the cover in your garage. This is a feature that no Fiberglass product can offer. Undercover uses the most technically advanced software, machines, and equipment in the industry to provide you with a cover that fits precisely to your truck bed. The team at UnderCover spent countless hours designing a cover that not only fits the truck perfectly but also matches the look of the newer model trucks and remains low profile.