UnderCover Flex hard folding tonneau cover closed and flush across the full bed, wide rear three-quarter view showing the panel seams and low-profile rails.
UnderCover Flex hard folding tonneau cover part-open with the rear panel folded forward over the middle panel, rear three-quarter view, textured gloss-black panels.
UnderCover Flex hard folding tonneau cover closed and flush across the full bed width, straight rear view.
UnderCover Flex hard folding tonneau cover closed, full side profile of the bed showing the cover sitting flush with the bed rail line.
UnderCover Flex hard folding tonneau cover part-open with the rear panel folded forward, full side profile showing the rear third of the bed exposed.
UnderCover Flex hard folding tonneau cover folded fully open and stacked at the bulkhead with the tailgate closed, the whole bed floor visible over the tailgate, rear three-quarter view.
UnderCover Flex hard folding tonneau cover part-open with the rear panel folded forward, about a third of the bed exposed, rear three-quarter view.
UnderCover Flex hard folding tonneau cover part-open with the rear panel folded forward, straight rear view across the full bed width.
UnderCover Flex hard folding tonneau cover fully open and folded upright against the bulkhead with the tailgate closed, straight rear view into the empty bed.
UnderCover Flex hard folding tonneau cover folded open and stacked against the bulkhead with the bed open, straight rear view.
UnderCover Flex hard folding tonneau cover folded fully open and stacked upright at the bulkhead, full side profile view.
UnderCover Flex hard folding tonneau cover part-open with the middle and rear panels folded forward onto the front panel, full side profile showing the rear two-thirds of the bed exposed.
UnderCover Flex hard folding tonneau cover shown closed in a ghosted-vehicle illustration, rear three-quarter view, gloss-black panels flush with the bed rails.
Close-up of the RealTruck UnderCover nameplate badge on the textured gloss-black panel surface of the Flex cover.
Close-up of the Flex side rail and end cap at the rear corner of the bed.
Close-up of the Flex prop-rod pivot bracket on the cover's textured inner panel face with the rod extended.
Close-up of the Flex drain tube and clamp at the front corner of the bed with the cover raised above.

UnderCover Flex Hard Folding Tonneau Cover

$1,099.99
FREE SHIPPINGNo sales tax Only 1 leftIn stock now  Estimated delivery
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Ships separately and arrives in 7 to 14 days

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The only gloss black cover

Every other cover UnderCover builds is matte. The Flex is the one finished in gloss black, a corrosion-resistant textured coat over aluminum-skinned panels, so the bed reads as a painted surface alongside the cab rather than as a flat black panel bolted to it. Textured rather than smooth is the point: it holds the gloss without turning the whole cover into a mirror for every scratch. What sits underneath is the same rigid aluminum tri-fold rated to 400 lb evenly distributed, with a three-year limited warranty behind it.
UnderCover Flex closed and flush across the bed, full side profile

Rubber at every joint that matters

The Flex is the one cover in the folding range where UnderCover names the hinge material as well as the seal material. EPDM rubber hinges join the panels, EPDM seals close the perimeter, and a dual-action tailgate seal handles the joint at the back of the bed where covers usually leak first. Water that does get past all that lands in the cover's own integrated drain channels and is carried down through the bed rather than onto your cargo. It is a water-resistant cover rather than a sealed box, and the drainage is designed on that assumption.

Frequently Asked Questions

Straight answers on specs, fit and support

Will it keep my bed dry in heavy rain?

It keeps most of the weather out, and UnderCover does not call it waterproof. EPDM rubber seals close the perimeter, EPDM rubber hinges join the panels, a dual-action seal handles the tailgate, and integrated drain channels collect whatever gets past them and carry it down through the bed and out under the truck. In sustained heavy rain or under a pressure washer, expect some water at the bulkhead corners and along the seams between panels, because a folding cover has joints that a one-piece lid does not have. Where the drains exit the bed is specific to your truck and is drawn on the installation sheet in the carton. Treat this as a highly water-resistant cover and keep anything that genuinely must stay dry in a sealed container.

How hard is the install, and do I have to drill?

Nothing is drilled into the truck to mount the cover on any Flex application. UnderCover rates it a Level 1 install in under an hour: the side rails clamp to the inside of your bed rails with the hardware in the box, and the cover sits on those rails. The drill bit you will see on the tools list belongs to the drainage, not the cover. Depending on the truck, the drains route behind a bedliner, through the existing bed plugs, or through a hole you make for them, and a small number of applications have no drain tubes at all. One application, the Jeep Gladiator, also asks you to cut a marked section out of the plastic bed cap, which is permanent, so check the sheet for your truck before you start rather than after. Work from the vehicle-specific installation sheet in the carton rather than from a walkthrough shot on someone else's truck. A second pair of hands makes lifting the folded cover over the bed rail much easier.

How does it behave in snow and ice?

Clear it off before you open it. That is a warranty condition rather than a suggestion: UnderCover requires the cover to be free of all foreign materials including snow and ice before opening, and forcing frozen panels apart is how rubber hinges tear and seals pull away. Closed, the panels will carry a snow load inside the 400 lb evenly distributed rating. EPDM stays flexible in cold better than most rubbers, but any seal stiffens once it has sat out overnight, so a cover that has been frozen will feel tighter than it does in July and should be worked gently rather than forced. UnderCover publishes no operating temperature range for the Flex, so we are not going to quote one.

Will the latches hold, and what if my bed is not square?

Rail alignment is what decides this, not the latch. UnderCover's sheet is blunt about it on most applications: the side rails must sit square, at a 90 degree angle to the bed rails, or the rear latch will not engage properly. If the cover will not catch at the back, check the rails before you blame the latch. Every Flex installation sheet also carries a latch adjustment procedure, so work through that before concluding a part is faulty. UnderCover asks you to re-check every clamp and retention mechanism for tightness about a week after installation and periodically after that, because rails that were square on day one can shift as the clamps settle. One thing to be plain about: there is no lock on the cover itself and UnderCover publishes no lock type for the Flex. The release cables sit inside the bed, so the cover can only be opened with the tailgate down, and locking the tailgate is what secures the bed.

Will it clear my bed rails, bedliner, rail caps or cargo lights?

The part number decides most of this, so read the qualifier in this listing's title before anything else. UnderCover builds separate Flex parts for beds with factory bed rail caps, the Nissan Utili-Track, the Toyota Deck Rail System, the Ram RamBox with silver cargo rails, and the Ram Multifunction Tailgate, and the part for one of those will not fit a plain bed. Beyond that, the side rails clamp to the inside of your bed rails, so a drop-in liner with a lip folded over the rail, aftermarket rail caps, or anything bolted along the inner bed rail can sit where a clamp needs to go. Drain routing passes behind or through a liner. No UnderCover cover fits a CarbonPro bed. UnderCover publishes no clearance dimension for the Flex, so if you run bed-rail accessories or cargo lights, measure what sits inside your bed rails before you order.

How much does it weigh, and can I take it off on my own?

Depending on the application the Flex ships at roughly 70 lb to 100 lb, with the long-bed parts at the top of that range. That figure is the packaged shipping weight, because UnderCover publishes no weight for the cover on its own, so the cover is lighter than the number you see quoted. Taking it off is the Flex's own party trick and the one thing it does that no other UnderCover folding cover claims: the quick-release hardware releases without tools, so the cover comes off in seconds. One person can manage a folded cover off a short bed, though the awkward part is the lift over the bed rail rather than the weight itself, and two people make it a much shorter job on any bed. The side rails stay clamped to the truck, so taking the cover off for a tall load is nothing like a full uninstall.