Introducing the next generation of folding covers -- the UnderCover Flex folding cover. Flex combines the best of both worlds, the security of a hard locking cover and convenience of a soft roll up cover. Constructed from the best materials available, Flex will withstand the abuse Mother Nature throws at it and keep coming back for more. Low Profile -- Ultra-low profile design rests inside the bed rails allowing for a very sleek look. Full Access -- Built in prop rods secure the cover allowing your truck to be driven with the cover fully open. Easy Removal -- Entire cover can be removed in seconds with no tools needed. Secure Design -- Plastic buckles and straps are included to secure the panels in the partially open position. FRP Composite Panels -- Lighter, stronger and higher dent resistance than aluminum. Weather Resistant -- Rubber seals and drain tubes channel water away from and out of the bed. Easy Clamp-on design. No other folding cover can match the Flex for versatility, security and function. Covered or uncovered, always an option with UnderCover. UnderCover Flex 2007-2021 Toyota Tundra 5ft. 6in. Bed CrewMax with Deck Rail System without Trail Special Edition Storage Boxes-Black Textured Will not fit with Trail Special Edition Bed Storage Boxes 2007-2020 Toyota Tundra 66.7 Bed, 2021 Toyota Tundra 1794 Edition 66.7 Bed, 2021 Toyota Tundra Limited 66.7 Bed, 2021 Toyota Tundra Nightshade 66.7 Bed, 2021 Toyota Tundra Platinum 66.7 Bed, 2021 Toyota Tundra SR5 66.7 Bed, 2021 Toyota Tundra TRD Pro 66.7 Bed