UnderCover Armor Flex Review

UnderCover Armor Flex tonneau cover features robust construction with an aluminum core and a protective LINE-X coating, ensuring durability and style.

Line-X coating is a highly durable, impact resistant spray-on protective material used primarily for truck bedliners, but also for various industrial, marine, and vehicle applications.

UnderCover Armor Flex trifold truckbed cover
UnderCover Armor Flex Hard tonneau cover

Its unique Dual Action Tailgate Seal provides seamless access, while the low-profile design enhances the truck’s appearance.

UnderCover Armor Flex is a premium tonneau cover, that excels in safeguarding cargo, while the easy-to-use folding mechanism offers convenient bed access. This cover stands out for its blend of robust protection, style, and functionality.

After extensively testing the tonneau cover across my fleet of trucks, including the 2023 Canyon Denali and the 2019 Trail Boss, I’ve gained valuable insights, here’s a summary of my personal experience:

  • Quality and Appearance: The cover is impressively built, featuring a high-quality construction and a sophisticated appearance. It significantly enhances the look of entire truck, adding a professional touch.
  • Ease of Installation: I found the installation process generally straightforward. Most of the time, I could handle it alone, but for larger truck models or when I was less experienced, an extra pair of hands proved helpful.
  • Weather Performance: The cover performs admirably in terms of keeping the truck bed dry. Even under harsh weather conditions and during car washes, I only noticed minimal leakage, primarily around the tailgate sides and front corners.
  • Fit and Sizing: I did encounter some issues with the cover being slightly long once. Making adjustments was sometimes a challenge, and achieving a perfect fit could be tricky.
  • Waterproofing: Although the cover does a decent job at water resistance, I noticed some leakage, especially at the front corners and around the wheel wells. A better gasket system could enhance its waterproofing capability.
  • Installation Challenges: I noticed some challenges with the rail clamps. The lack of clear markings made it tricky, and the instructions provided weren’t very clear. Installation videos in YouTube were helpful.

Let’s check the table of specs.

Cover TypeHard Folding
DesignLow profile
LatchingSlam Latches on both sides
Panel CoreAluminum
Frame MaterialAluminum
Panel ExteriorLine-X coating
Included accessoriesEPDM Rubber seals, drain tubes, prop rods
FinishTextured Black
Weather ResistanceWater-Resistant, Rust Resistant
Weight CapacityUp to 400 lbs
Cover WeightApproximately 70 lbs
Bed AccessFull bed access
Tailgate SealDual Action Tailgate Seal
Warranty5-Year Limited
UnderCover Armor Flex Specifications


UnderCover Armor Flex DIY Installation
UnderCover Armor Flex easy installation

Let me break it down for you. The UnderCover Armor Flex tonneau cover has a textured black finish that keeps it looking fresh no matter how old it gets.

With its sturdy aluminum core, you can trust this cover to protect your truck bed from the elements.

The frame is made of aluminum, painted matte black to match the panels and prevent rust. But the real game-changer is the sleek LINE-X coating, known for its durability and long-lasting protection.

For those who don’t know, the LINE-X coating is also used in boats, bridges, and trailers because this coating provides an indestructible defense against all kinds of environmental factors.

What I love most is the low-profile design, adding class and improving your truck’s aerodynamics. Plus, the Dual Action Tailgate Seal makes closing the cover super easy, whether your tailgate is up or down.

And let’s not forget about full bed access! You don’t need to remove the whole cover to get in there. The prop rods hold it at a 90-degree angle, so you can access your truck bed effortlessly.

And same goes for UnderCover Ultra Flex, Click to know more about it.

One thing to note is that it completely blocks the back windshield, but you can adjust it to 2/3 folds after loading your stuff.

The rubber seals are made of specialized EPDM rubber, keeping everything watertight and airtight. They also direct water towards the drain tubes. Overall, this cover brings style, durability, and convenience to the table.

Does UnderCover Armor Flex Cover leak?

The UnderCover Armor Flex tonneau cover indeed excels in keeping water out of the truck bed. The specialized EPDM rubber seals play a crucial role in ensuring excellent water drainage.

Based on my experience, I’d confidently rate this cover 9.5/10 in terms of its water resistance capabilities. It’s rare to find a cover that performs this well when it comes to keeping your cargo dry, especially during heavy rains or harsh weather conditions.

Have you ever been curious about why tonneau covers leak? To find out read our detailed article on it here https://toptonneaureview.com/do-all-tonneau-covers-leak/

So, if you’re looking for a tonneau cover that provides top-notch water protection, the UnderCover Armor Flex is definitely worth considering.

It won’t let you down when it comes to keeping your truck bed safe from water leakage and ensuring your belongings stay dry and secure.

Is UnderCover Armor Flex Secure?

UnderCover Armor Flex installed
UnderCover Armor Flex Installed on GMC Sierra

Let’s chat about security when it comes to the UnderCover Armor Flex. With a solid aluminum core, this thing means business. It’s built like a tank and adds a solid layer of protection for your truck bed.

Now, about that fancy Dual Action Tailgate Seal, it gives you a tight fit and helps keep your stuff out of prying eyes. It’s a neat little feature that adds to the overall security of the cover. No one can take a peek into your stuff.

However, let’s be real for a moment. Nothing’s 100% foolproof, not even the Armor Flex. But compared to not having a cover at all, it’s a huge step up in security.

You can’t beat having a strong, sturdy cover over your gear, especially when you’re parked up in the city or out on a trip. I am pretty impressed with how this cover helps to protect their stuff.

Sure, there might be the odd grumble about wishing for an even stronger lock system, but on the whole, folks seem to be pretty happy with the level of security the Armor Flex offers.

Before you make a decision, check our list of best trifold hard tonneau covers. Click here.

So, there you have it. The UnderCover Armor Flex might not be the safest, but it definitely brings a hefty dose of security to your truck bed, giving you that extra peace of mind. And let’s face it, that’s what we all want, right?

Is UnderCover Armor Flex worth the money?

UnderCover Armor Flex matte finishing
UnderCover Armor Flex powder-coated top

The UnderCover Armor Flex comes with a price range of $1,299.99 to $1,349.99, making it a mid to high-end option. The cover’s price may seem higher compared to some other options on the market.

However, I would consider this investment worthwhile due to its durable construction, LINE-X coating, excellent water drainage system, and added features like the dual-action tailgate seal and full bed access.

Additionally, the cover comes with a 5-year warranty and a 30-day cashback offer, so you can get your money back in case you change your mind.


So, here’s the deal with the UnderCover Armor Flex tonneau cover. It’s more than just a pretty face with that textured black finish and LINE-X coating. It’s a sturdy, reliable cover that’s got your truck bed’s back, no matter the weather.

Now, it might feel like a bit of an investment at first. But trust me, it’s worth every penny. You’re getting durability, style, and most importantly, peace of mind. It’s like the saying goes, “Buy nice or buy twice,” and this is definitely a case of buying nice.

So there you have it, my two cents on the UnderCover Armor Flex. If I had to buy a tonneau cover again, I wouldn’t hesitate to pick this cover. It’s been a champ for my truck and I’m sure it’ll be the same for yours.