The Access LiteRider Tonneau Cover is no ordinary tonneau cover. It’s UV resistant finish and double reinforced commercial grade vinyl separates this real performer from the tonneau of fakes. Pun intended. Still flexible at under -40 degrees Celsius, it won't shrink or fade when exposed to the heat or to the toughest of climates. The clamps inside the bed rails are composed of sturdy aircraft grade aluminum metal. Made with specially cut teeth that help maintain grip in your truck bed giving these clamps exceptional strength and unsurpassed quality!