RealTruck UnderCover Ultra Flex Hard Folding Tonneau Cover RealTruck UnderCover Ultra FLEX Hard Folding Tonneau Cover Flex Tonneau Cover Low Profile Folding Tonneau Stealth Hard Folding Tonneau Cover LINE X of Tallahassee Rough Country F 150 Hard Low Profile Tri Fold Tonneau Cover 47221550B. Undercover Flex tonneau covers leave other types of folding tonneau covers in the dust! These Flex covers feature a sleek, low profile look that fits flush with the bed rails and folds to allow easy access to the full cargo area. Plastic buckles and straps secure the FRP panels in the partially open position, or use the built in prop rods to secure the covers, allowing your truck to be driven with the covers fully open. These Flex covers are constructed from advanced fiberglass reinforced polymer material. They're UV resistant and feature weather resistant rubber seals and drain tubes to channel water away from and out of your truck bed. Undercover Flex covers install easily in minutes, with no drilling required, and can be removed in seconds no tools are needed.