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.


489 Total
Ronald B.
2009 GMC Sierra 1500
5 / 5
30 July 2020
The undercover flex makes my truck look and feel brand new again! Absolutely Stunning!
Michael A.
2020 Ram 1500
5 / 5
27 July 2020
great product...will recommend to everyone
Daniel S.
2019 Ram 3500
5 / 5
17 July 2020
Great product. Very happy.
Daniel S.
2017 Ford F-350 Super Duty
5 / 5
16 July 2020
Looks good
Michael F.
2020 Ford F-150
5 / 5
16 July 2020
Nowhere in the instructions does it say what to do with the foam gasket you provide. I assume it was supposed to go at the front of the fixed panel closest to the back glass.
David S.
2017 Honda Ridgeline
5 / 5
14 July 2020
I love the flush design of the Flex. It also seems to be very well engineered.
John S.
2015 Ford F-150
5 / 5
13 July 2020
Great product and great customer service
steven s.
2019 Ford Ranger
5 / 5
7 July 2020
Excellent quality and materials
Lyle M.
2018 Ford F-150
5 / 5
19 June 2020
Will certainly add value to the vehicle
Richard C.
2020 Toyota Tacoma
5 / 5
11 June 2020
Great product very pleased with the quality and low profile look. Very easy to operate and locks automatically. It folds up close to the back window to get the full use of bed without removing cover.