UnderCover Flex Truck Bed Covers

Starting at $879.00


The UnderCover Flex is a hard folding truck bed cover that gives you the ultimate control of your truck bed, offering three secure riding positions. The cover is easy to install and remove with our easy clamp-on design, and is mounted flush with your trucks bed rails making it the most watertight hard folding cover on the market. The Flex is constructed with heavy-duty aluminum panels providing strength and durability.

Each Flex has a bed rail mounting system equipped with rubber seals and drain tubes that carry water away from and out of the bed, keeping your gear dry and secure. The Flex is backed by a 3-year warranty making it America's favorite hard folding tonneau cover.

  • Low-Profile Design w/ an UV Protective Black Finish
  • Aluminum Top Skin Panel
  • Three Secure Driving Positions, with 100% Bed Access
  • Dual Action Tailgate Seal for Easy Operation
  • Made in the USA


Please feel free to make use of the UnderCover Flex installation instructions below to assist you. Upon purchase you’ll receive vehicle specific instructions. However, if you have further questions or need technical assistance, please call one of our knowledgeable installation experts at 866-900-8800.


The UnderCover Flex carries a 3-year warranty.


Is the Flex waterproof?
The Flex is weather resistant. The Flex utilizes rail channels and drain tubes to move water away from the bed. Ultimately, no folding cover is completely waterproof as there are tailgate gaps and other areas that may allow some intrusion.

What is the install time on the Flex?
The Flex can usually be installed in about 45 minutes

Can I drive with the cover in the upright position?
Yes. The Flex utilizes strut mounts to stabilize the cover while driving.

Will the cover work with a 5th wheel hitch?
Yes. There are two available cover positions while pulling a 5th wheel. Upright and ¾ bed access.

How fast can I drive with the cover in the upright position?
We do not assign a speed rating to the Flex in the upright position, but it is well equipped to handle legal interstate speeds.

What is the warranty on the Flex?
3 Years on workmanship and materials. 1 year on hardware.

Can I see out the back window with my Flex fully upright?
No. The cover in the upright position will block view out the back window.

How easy is it to remove my Flex cover?
Simply unscrew the two elevator bolts and lift!

How can I get the side seals to lay flat on my new Flex?
After a day or two, direct sunlight will be absorbed and help the seals lay flat.

Do I need to drill into my truck when installing the Flex?
No. The Flex utilizes clamps and a no-drill installation.

Does my Flex work with a standard toolbox?
No. Flex cannot be installed with a toolbox.

How secure is my Flex cover?
The Flex secures your cargo with the help of a tailgate lock. The only access point is the pull cord underneath to open the cover. If your tailgate is locked, your cover is locked.

Where is the Flex made?
All UnderCover products are proudly made in the USA.

Is the Flex compatible with my bedliner?
Yes. The Flex will work with BedRug, spray-ins and any under the rail bedliner. Flex is also compatible with many aftermarket bed caps.

Full Bed Access

Built-in prop rods secure the cover allowing your truck to be driven with the cover fully open.

Weather Resistant

Rubber seals and drain tubes channel water away from and out of the bed.

Heavy-Duty Construction

The Flex is constructed with heavy-duty Aluminum panels providing strength and durability. The SpeedKlamps lock the cover in place at the rear, adding strength and stability for your off-road adventure.


538 Total
Thomas K.
2015 Chevrolet Colorado
5 / 5
15 October 2020
I love the appearance and ease of use of my new cover. I'm sure I made the right decision.
Ricky E.
2017 Ford F-350 Super Duty
5 / 5
14 October 2020
Great product!
Jitendra S.
2019 Ford F-150
5 / 5
14 October 2020
Product so far is awesome, I got it purcahsed and installed at Texas Customs & Accessories, these guys are awesome.
David B.
2018 Toyota Tacoma
5 / 5
12 October 2020
Product is great company is even better.
patrick m.
2020 Ford F-150
5 / 5
8 October 2020
Great product and price. Easy to use.
Stacy K.
2020 Jeep Gladiator
5 / 5
5 October 2020
This is my second Undercover tonneau cover. The Flex cover installed easily on my Jeep Gladiator, looks good and very functional for my needs.
Max M.
2020 Ram 1500
5 / 5
4 October 2020
Great Installation Job Looks attractive with my new Dodge Ram
Ralph M.
2020 Chevrolet Silverado 1500
5 / 5
3 October 2020
I love it, very nice!!
Steve J.
2011 Ford F-150
5 / 5
26 September 2020
Best thing I could have received as a gift. It serves its purpose.
Brian S.
2019 Ford F-150
5 / 5
23 September 2020
Had issue with first unit, undercover stood by product and sent replacement.