UnderCover Ultra Flex Truck Bed Covers

Starting at $989.00


A hard folding truck bed cover that comes with overwhelming new features and is topped off with an alluring matte finish. The Ultra Flex is in a category of its own. From the irresistible outward appearance to each component beneath the cover, the Ultra Flex has been carefully crafted to be the ultimate all-purpose truck bed cover.

All-new features that accompany the Ultra Flex include an integrated luminous rail light system for enhanced night vision, and a dual action tailgate seal, allowing for easy operation and you to close the tailgate with the cover-up or down. Multiple riding positions allow the user to ride with full access to their bed, and full weather protection is available if the cover is in the fully closed position.

Ultra Flex is an easy clamp-on application and can be installed and removed easily with our newly designed L-Rail’s. What’s more, the Ultra Flex is backed by a 5-year warranty, making it the most desirable folding cover on the market.

  • Ultra Low-Profile Design w/ a Stylish Matte Black Finish
  • Integrated Luminous Bed Rail Light
  • Carpeted Underpanels Provide a Finished OEM Look
  • Dual Action Tailgate Seal for Easy Operation
  • Made in the USA


Please feel free to make use of the Ultra 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.

Supplemental Guide



The UnderCover Ultra Flex carries a 5-year warranty.


How does the Ultra Flex differ from the Flex?
The Ultra Flex has many different features than the Flex. Ultra Flex has a matte black finish, carpeted under panels, universal tailgate operation and an L-Rail install. The cover also comes with an integrated luminous rail light system for enhanced night vision. The Ultra Flex panels are made of aluminum providing strength and durability.

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

Is the Ultra Flex dent resistant?
Yes. The Ultra Flex panels are the thickest panels in the industry. Dent resistant, not dent proof.

Can you open and close the tailgate with the cover in the closed position?
Yes. The Ultra Flex provides dual action tailgate seal for easy operation. The tailgate can be opened and closed with the tonneau in the closed position.

What are the Ultra Flex panels made out of?
Aircraft Grade Aluminum coated with a matte black finish.

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

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

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

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

How do I change the batteries in my B-Light system?
Remove the battery pack/switch panel from the hook and loop attachment. Unscrew the one screw and replace the batteries.

Stylish Matte Finish

Solid aluminum panels polished with stylish matte black finish.

Ultra Finish Under Panel

A refined and Ultra tough carpet-like finish gives the Ultra Flex an OE look and feel.

Integrated Rail Light

The integrated luminous rail light provides illumination in your truck bed at night.


509 Total
Forrest K.
2020 Ram 1500
5 / 5
3 August 2020
I had one of these covers on my last truck, and loved it! My daughter had one installed on her new truck, as well.
Richard H.
2020 Ram 2500
5 / 5
2 August 2020
Great cover. I traded in my 2019 Ram 1500 Limited for a 2020 Ram 2500 Laramie. The 1500 had the Undercover Ultra Flex and I had to have one on the 2020 Ram 2500. Best cover by far.
James K.
2020 Ford F-250 Super Duty
5 / 5
30 July 2020
Easy installation and great looking.
Craig N.
2019 Ford Ranger
5 / 5
29 July 2020
Very happy with the installation and the product. In a summer thunderstorm only a very tiny bit of water made its way in one one corner. I had a dually with a soft cover that was not nearly as nice.
Alan P.
2020 Toyota Tundra
5 / 5
29 July 2020
This is the second Undercover folding hard tonneau cover I've owned. This first was on a 2007 F-150. It's still in great shape after 13 years of use in Alaska (9 years), New Mexico (2 years) and South Dakota (2 years). Now my grandson has it. You make an excellent product.
Charles A.
2020 Ram 1500
5 / 5
28 July 2020
Great product, great quality, awesome appearance.
Joel P.
2017 Ram 1500
5 / 5
22 July 2020
I’m very happy with this product.
Quincy M.
2018 Chevrolet Silverado 1500
5 / 5
16 July 2020
Good Quality
Dayne P.
2014 Ford F-150
5 / 5
7 July 2020
Great product
2020 Ford F-150
5 / 5
7 July 2020
The cover looks amazing and it's easy to open and fold back to allow access to the truck bed. It's exactly what I was looking for. Hopefully it holds up for years to come. Time will tell.