AutoAnything, Inc.
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UnderCover Flex Tonneau Cover Flex Tonneau Cover - FX31008

269 Reviews
List Price
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Ships between 09/29/2022 - 10/06/2022
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Product Info
  • Flex your truck’s cargo-covering muscle with the Undercover Flex Tonneau Cover
  • Built tough from fiberglass-reinforced polymer (FRP) and an aluminum top skin panel to keep weather and would-be thieves out
  • Advanced fiberglass panels with reinforced polymer material produce a subtle textured finish
  • Three secure driving positions allow for more hauling versatility and 100% access
  • Special prop rods let you flip this truck bed cover completely open and secure in place
  • Easy-to-use slam latches allow you to open the cover from either side of the truck
  • Panels are connected with a seamless, leak-proof rubber seal to lock out moisture
  • Hinges and panels won’t crack, warp, fade, rust or corrode in extreme weather
  • Integrated drain tubes whisk any accumulating water away from your carg
  • Flush-fit design can’t be opened when the tailgate is locked, providing added security
  • Hard top surface supports up to 300 lbs of evenly distributed weight
  • Fully compatible with under-the-rail bedliners, spray-in bedliners, snug-fitting bed rails and tailgate caps
  • Simple clamp-on system allows for easy, no-drill installation and removal
  • Your Undercover Flex Tonneau Cover is crafted right here in the USA and backed by a 3-year warranty
  • Click to View Undercover Folding Tonneau Cover Comparison Guide (PDF)
  • The Undercover Flex features a textured glossy finish on its exterior panels. If you are looking for a premium matte finish instead, try the Undercover Ultra Flex

The whole reason why drive our trucks in the first place is because we like options. Fortunately, that’s where the Undercover Flex Tonneau Cover excels. It’s not only sleek and sturdy, but it folds back to allow full bed access faster than you could say, "How do I get off this balance beam?"

When it comes to having an efficient hauling setup, innovation is always welcome. Featuring three folding panels, the Flex folding tonneau cover offers three secure driving positions and full bed access. A unique strut system allows the cover to store vertically, opening the entire truck bed up for all sorts of hauling heyday. It’s made from fiberglass with a dual-action tailgate seal and a flush-fitting design, so it’s (almost) as secure as a bank vault and crazy watertight. A rubber seal runs the length of the cover, and a clever drainage system ensures your truck bed will never be mistaken for an above-ground pool.

Crafted from a fiberglass reinforced polymer and rigid aluminum with a subtle textured finish, the Flex folding tonneau cover can shoulder up to 300 (evenly distributed) pounds on top. And, like a Beverly Hills face, it'll never crack, warp, fade, rust or corrode. This stout truck bed cover keeps your bed clean, dry and secure – that’s called a triple threat. The simple clamp system makes it easy to install and remove with no drilling required. Best of all, Undercover backs your Flex Tonneau Cover with a solid 3-year warranty.

The Undercover Flex truck bed cover features a textured glossy finish on its exterior panels. If you are looking for a premium matte finish instead, try the Undercover Ultra Flex.

Click to view the Undercover Folding Tonneau Cover Comparison Guide (PDF)

Frequently Asked Questions

How secure is the Undercover Flex Tonneau Cover?
The cover panels are made from fiberglass reinforced material which is stout and heavy duty. It would require a lot of force and dedication to puncture the surface. Out of sight, out of mind is key. Covering your gear severly limits someone's interest in what may or may not be in the truck bed. As long as your tailgate is locked, the cover is relatively secure.

Is the Undercover Flex waterproof?
Ultimately no truck bed cover is totally waterproof, unless it's a fully overlapping style. Most hard folding covers do a pretty good job keeping major water out, but their joint sections can allow minor water ingress under extreme weather conditions.

Where is the Flex bed cover made?
Flex tonneau covers are made in the USA.

Can I put cargo on top of the Flex truck bed cover?
Yes, putting cargo on top of the tonneau is possible. Absolute maximum capacity is 300 lbs of evenly distributed weight on the Flex. For even greater capacity, consider the Ultra Flex.

How do I lock the Flex if my truck doesn't have a tailgate lock?
Pop & Lock Tailgate Locks are available for most trucks as an aftermarket solution that can be retrofitted if your truck was not originally equipped with a tailgate lock. Sold separately, available at AutoAnything.

  • The tailgate lock on the truck is what secures the bed. If your truck does not have a tailgate lock, the cover may be opened by opening the tailgate. Tailgate locks sold seperately
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Customer Reviews

Average Rating
Ease of Installation
269 Customer Reviews
5 Star
209 (78%)
4 Star
45 (17%)
3 Star
7 (3%)
2 Star
5 (2%)
1 Star
3 (1%)

Great tonneau cover

This does everything I need it to do installation was easy less then 30mins and the finish is nice top best part people always ask where I got mines and that they like it.
Ease of Installation
Posted By Jeffrey V (BELLFLOWER, CA) / March 10, 2020
2019 Ram 1500
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