The Extang Solid Fold ALX is a hard, tri-fold truck bed cover. The Solid Fold ALX tonneau is made with TPO dent-resistant panels and integrated snap on seals to make the most durable and weather resistant hard folding cover on the market. The Solid Fold ALX has a textured, matte finish that gives the ALX an unmatched OEM look. The Solid Fold ALX comes fully assembled out of the box and installs in seconds. Solid Fold ALX - The Next Generation of the Extang Solid Fold!