UnderCover Flex Truck Bed Covers

Starting at $919.00


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.

Interactive Image

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.


686 Total
Rupert S.
2020 Ford Ranger
5 / 5
7 August 2021
great service and quality product
Billy L.
2018 GMC Sierra 1500
5 / 5
27 July 2021
Great product and great dealer installer
Chester D.
2017 Ram 2500
5 / 5
26 July 2021
Overall best cover on the market and for the price the ease of installation and overall the construction of the product. You will not be disappointed.
Leland W.
2020 Chevrolet Silverado 1500
5 / 5
23 July 2021
My 3rd undercover bed cover is why I keep coming back. Quality product and great service.
Dean V.
2021 Nissan Titan
5 / 5
23 July 2021
This is my third pickup cover I have purchased and it is so far the easiest to open and close and looks great.
Chester D.
2017 Ram 2500
5 / 5
21 July 2021
Great product and will recommend to anyone who wants a great product.
John S.
2019 Ram 1500
5 / 5
21 July 2021
Absolutely love the low profile look and how easy it was to install yet it is well built and on strong.
John E.
2018 Ram 1500
5 / 5
12 July 2021
Owned the older model on my 2012 Silverado. Could definitely tell the difference in craftsmanship and quality in the newer model
Gabriel P.
2019 Ram 1500
5 / 5
11 July 2021
This is my second one. The first was on a 2013 Ram 2500. Love the product! My Brother has owned 2 as well
Rodney J.
2013 Ram 1500
5 / 5
6 July 2021
Excellent job
Mark A.
2018 GMC Sierra 1500
5 / 5
2 July 2021
Really helpful to watch installation video on my make of Pick Up. Had the cover installed in approx. 45 minutes, start to finish. Fit and Finish is perfect.
Michael T.
2019 Ford F-150
5 / 5
25 June 2021
Great too, allowed me to travel across the country with my belongings safe
Jerry S.
2016 Ford F-150
5 / 5
24 June 2021
Very easy to install. It would benefit to have the help of a friend, but I could have done it myself. Looks great on the truck and feels very sturdy.
Carla H.
2017 Ford F-150
5 / 5
22 June 2021
A friend of mine bought her truck and had the same cover installed and highly recommended the Ultra Flex Titan. The guy at the Truck store said it was their best seller and that sold me.
Bill S.
2018 Chevrolet Colorado
5 / 5
18 June 2021
Pleased with salesmanship and care taken during installation.