UnderCover Ultra Flex hard folding tonneau cover closed and flush on a pickup bed, rear three-quarter view, textured matte-black panels level with the bed rails.
UnderCover Ultra Flex hard folding tonneau cover closed and flush on a pickup bed, rear three-quarter view showing the panel seams and low-profile rails.
UnderCover Ultra Flex hard folding tonneau cover closed and flush on a pickup parked on a grassland track, rear three-quarter view.
UnderCover Ultra Flex hard folding tonneau cover closed and flush across the full bed width, straight rear view.
UnderCover Ultra Flex hard folding tonneau cover part-open on a pickup bed, rear panel folded forward onto the middle panel with its grey underside facing up and the rear third of the bed exposed, rear three-quarter view.
UnderCover Ultra Flex hard folding tonneau cover part-open with the rear panel folded forward over the middle panel, rear three-quarter view.
UnderCover Ultra Flex hard folding tonneau cover folded fully open and standing upright at the bulkhead, whole bed floor exposed, rear three-quarter view.
UnderCover Ultra Flex hard folding tonneau cover folded open and stacked at the bulkhead with the bed exposed, rear three-quarter view.
UnderCover Ultra Flex hard folding tonneau cover folded fully open and propped upright at the bulkhead, full bed floor exposed, rear three-quarter view.
UnderCover Ultra Flex hard folding tonneau cover part-open with the rear panel folded forward, straight rear view.
UnderCover Ultra Flex hard folding tonneau cover folded open and stacked against the bulkhead, straight rear view into the bed.
UnderCover Ultra Flex hard folding tonneau cover folded fully open and standing upright against the bulkhead, straight rear view along the empty bed floor.
UnderCover Ultra Flex hard folding tonneau cover folded open at the bulkhead with the bed loaded with gear, real-world scene on a grassland track.
Close-up of the Ultra Flex panel edge extrusion and latch catch seated on the side rail.
Close-up of the Ultra Flex cover's matte-black panel and rear edge with the RealTruck UnderCover nameplate.
Close-up of a raised Ultra Flex panel's grey underside and its prop-rod pivot bracket, open water out of focus behind.
Close-up of an Ultra Flex buckle end and its webbing strap anchored to the panel surface beside the side rail.
Close-up of the Ultra Flex front corner bracket where the cover rail meets the bulkhead cap.
Close-up of an Ultra Flex panel held open by its prop rod, showing the rod's upper bracket on the panel's grey underside and its lower socket on the bed rail.

UnderCover Ultra Flex Hard Folding Tonneau Cover

$1,199.99
FREE SHIPPINGNo sales tax Only 1 leftIn stock now  Estimated delivery
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Fold It To The Cab And Drive

Full bed access on the Ultra Flex is not a two-thirds position. Fold the panels forward to the cab, secure them there, and UnderCover rates the truck to be driven with the cover fully open, so a load that will not go under a lid no longer means leaving the cover at home. A patented arrangement of rails and clamps is what holds it in either state, and the slam latches re-engage on their own the moment you fold it back down. On a truck that works for a living that is the difference between a cover you use all year and one you take off in April and hunt for again in October.
UnderCover Ultra Flex closed over the bed on a two-track trail

Tested Through Heat, Cold And Humidity

UnderCover ran the Ultra Flex from -40°F to 180°F and up to 95% humidity, and tested it for 7,500 hours. Those are the brand's own figures, and the Ultra Flex is the only folding cover it publishes test numbers for at all. Underneath the matte black surface the panels are premium-grade aluminum over a high-density polymer core, with an exclusive soft-impact underside that puts a padded layer between the cover and whatever is sliding around in the bed. Closed, those panels take up to 400 lb, provided the load is spread rather than stacked in one place.

Frequently Asked Questions

Straight answers on specs, fit and support

Will it keep my bed dry in heavy rain?

Highly water resistant, yes. Waterproof is a word UnderCover does not use about it, and neither will we. What the brand actually claims here is fit rather than drainage: reworked seals and close-fitting clamps that pull the cover hard down onto the bed rail, tested from -40°F to 180°F and up to 95% humidity. There is no published drainage specification for the Ultra Flex at all, so do not picture a sealed drain system quietly doing the work behind those seals. Every tri-fold has joints where its panels meet and a seam at the bulkhead, and heavy sustained rain, a pressure washer, or a bed slightly out of square will find them. Most applications do put drain tubes in the carton, routed out of the bed as part of the install, and the sheet for your own truck shows where yours go. Buy it to keep the weather off the bed. Anything that genuinely cannot get damp deserves a sealed box of its own.

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

No Ultra Flex application makes a hole in the truck to hold the cover on. UnderCover grades it Level 1 and quotes 30 minutes or less for one person on its Tip-and-Click system: rails on, clamps down onto the bed rail, cover clicked into place. Where a drill turns up on a tools list it belongs to the drain tubes rather than to the mounting, and which of those applies is a per-truck question. Every Tacoma and Tundra application has a sheet that does call for the hole. Most other beds let the tubes run behind a liner or drop through plugs that are already there. The Ram Multifunction Tailgate beds ship with no drain tubes in the kit at all. There is also one outlier worth knowing before you order rather than after: on the Jeep Gladiator, installation permanently cuts the plastic bed cap. Follow the sheet packed with your own part, since clamp positions, torque and drain routing are all set per platform.

How does it behave in snow and ice?

Get the snow and ice off the panels before you try to open them. UnderCover writes that into its warranty conditions rather than leaving it as advice: the cover has to be free of all foreign materials, snow and ice included, before opening, and levering frozen panels apart is how seals tear and latches bend. Left closed, a snow load is fine inside the 400 lb evenly distributed figure. Cold is also the one area where this family has published test data behind it, from -40°F up to 180°F and to 95% humidity across 7,500 hours, which tells you what the seals were built to survive without promising anything about your particular February. Every rubber seal goes stiff once it is cold enough, so expect a cover left out overnight to work harder than a summer one, and wipe the rail so the slam latches have something clean to seat on.

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

There is nothing at the rear of this cover to adjust. The slam latches grab each panel automatically as it comes down and re-engage themselves every time, so the setting that decides everything is made earlier, at the rails. Both have to sit at a right angle to the bed rails before the clamps are pulled tight. Out-of-true rails are the usual reason a rear latch stops catching, and the remedy is at the rail, not at the latch. UnderCover asks in its warranty conditions for all clamps and retention mechanisms to be checked for tightness roughly a week after fitting and at intervals from then on, which is worth doing even when nothing feels loose, since a rail can migrate slightly as the clamps bed in. Be clear on one point before you buy: UnderCover publishes no lock type for the Ultra Flex. You get latches holding the panels shut and a release inside the bed, not a keyed cylinder.

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

Your part number settles most of it, so start with the qualifier printed in this listing's title. Several factory bed options get an Ultra Flex part of their own instead of a shared one: Nissan's Utili-Track, Toyota's Deck Rail System, the RamBox with its silver cargo rails, and the Ram Multifunction Tailgate. A part built for one of those will not sit correctly on a plain bed, and the plain-bed part will not sit correctly on one of those. The rest comes down to whatever already lives on the inner face of your bed rail, because that is exactly where the clamps grip. A drop-in liner whose lip folds over the rail, aftermarket rail caps, tie-down track or a light bar bolted along the inside can all leave a clamp nowhere to land, and where a liner is fitted the drain tubes have to be threaded behind or through it. Nothing in this family is built for a CarbonPro bed. No clearance figure is published for the cover, so if your bed rail carries accessories, get a tape on them first.

How much does it weigh, and can I remove it alone?

Across the range the carton leaves at somewhere between 70 lb and 100 lb, the long-bed parts being heaviest. Read that as packaging plus cover and not as the cover alone: no figure is published for the bare cover, and the manufacturer's own answer to the question is that it varies with the truck. For fitting, UnderCover rates this a one-person job at 30 minutes or less, and the difficulty is the height of the bed rail rather than what you are carrying, so a helper saves more time than muscle. Removal is worth thinking about before you buy. The Flex is the model UnderCover sells on coming off in seconds without tools, and it makes no such claim for the Ultra Flex, so budget for an installation in reverse. The compensation is that you rarely need to bother. Folded to the cab and secured, this cover is rated to stay on the truck while you drive with the bed wide open.