The self-positioning, self-latching, tri-fold Extang Encore Bed Cover is simple to install and protects the contents of your pickup bed from both theft and weather. Three 1-thick, fiberglass-reinforced plastic panels fold up for full use of the truck bed and are easy to remove. Channel sealing in the side rails prevents moisture and dust from getting in. Tough, powder-coated aluminum frame holds panels in place. Cancer and Reproductive Harm- www.P65Warnings.ca.gov. Type: Bed Cover.