LeBra Rollup Tonneau Covers are one of the newest additions to the LeBra Tonno Cover Family. They were designed for customers who want the security of a truck tonneau cover with the convenience of an easily stowed vinyl tonneau. An advanced rail design extends the life of the entire fastening system and a buckle strap holds the cover to your pickup's cab rail. Unlike other systems, the LeBra Roll Up design also contours to the truck bed for better coverage, less chance for leakage, and less damage from flapping. Flapping is the enemy of most vinyl automotive products because it can weaken the cover over time. At highway speeds, the wave motions caused by wind are literally tugging at the material several hundred times per second. As with any material, it is best to keep it on nice and tight with fewer chances to wear out, even though we've designed this material to last a good long time! Tight fits also keep water from pooling on the surface of the cover and turning into ice, which is also not good for covers or the people who are driving behind your truck when a big saucer of ice flies off. Lastly, these covers not only help save on mileage and prevent water, snow, ice, sand, falling objects, and critters from getting into your truck bed, they also improve mileage by channeling wind over the truck bed instead of scooping it up. If you were ever around when kids routinely rode in the back of a pickup truck, you remember the biting cold wind that got you if you weren't hunched down around the front of the bed. We remember it too. That wind was literally slowing down the truck after it had already been pushed aside once. A good truck bed covering will prevent this drag, and save you gas money, which is just an added bonus compared to the protection you're getting.