2023-2025
2017-2022
2011-2016
2008-2010
1999-2007
Installation Time
(approx) 1 Hour
Difficulty Level:
Simple installation for anyone.
Installation Guides
No guide available for this part yet.
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UnderCover Armor Flex Tri-Fold Tonneau Cover (17-22 F-250 Super Duty w/ 8-Foot Bed)Find parts that fit my vehicle
Item SD3566
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8 Reviews
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$1,499.99 kit
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$129.00
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Product Information
Features, Description, Reviews, Q&A, Specs & Installation
Features & Specs
- To Learn How to Measure Your Bed Click Here
- Armor Flex Hard Tri-Fold Tonneau Cover
- Features Heavy-Duty Aluminum Panels
- Includes Pre-Assembled Rails
- Completed with Premium-Grade Line-X Coating
- Sports a Matte Black Finish
- With Dual Action Tailgate Seal
- Built with Automatic Latching Panels
- Simple Installation; No Drilling
- Covered by a 5-Year Warranty
- Tailored to Fit 2017-2022 Ford F-250 Super Duty Models with 8-Foot Beds
| Brand | UnderCover |
| Tonneau Cover Type | Hard Folding |
| Tonneau Cover Installation | Clamp On |
| Tonneau Cover Locking | Locking with Tailgate Lock |
| Toolbox Compatibility | Not Toolbox Compatible |
Description
Excellent Protection. Equipping your truck with this UnderCover Armor Flex Tri-Fold Tonneau Cover helps protect your truck bed and its cargo from various road hazards. With its hard and heavy-duty panels, this tri-fold tonneau cover won’t let any weather elements and road debris penetrate your truck bed. What’s more, its dual-action tailgate seal keeps your cargo safe from other people’s prying eyes.
Tri-Fold Design. This hard tonneau cover is easy to operate since it is built with a tri-fold design. Featuring three-segmented sections, you can also easily access your truck bed’s cargo by folding one or more of the panels.
Premium Construction. For long-lasting durability, this tonneau cover is built with heavy-duty aluminum panels and preassembled rails. Even when exposed to tough driving conditions, the cover is guaranteed not to bend or break. Furthermore, its construction is fortified with a premium-grade Line-X coating to protect it from weathering and corrosion.
Simple Installation. This tonneau cover can be installed by anyone with light to moderate mechanical skills. With the supplied clamps and hardware, this product is simple and quick to install. No drilling is required.
Covered by a 5-Year Warranty. For quality assurance, UnderCover is covering this product with a 5-year warranty. However, this warranty comes with limitations and exclusions. For the full warranty details, please visit the official UnderCover website.
Application. This UnderCover Armor Flex Tri-Fold Tonneau Cover is tailored to fit 2017-2022 Ford F-250 Super Duty Models with 8-foot beds.
Technical Note. Not sure of your bed size? Click here for an instructional video explaining how to measure your bed length.
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UnderCover AX22026
CA Residents: 
WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov
Installation & What's in the Box
Installation Info
What's in the Box
- (1) Flex Hard Folding Cover
- (1) Side Mounting Rail, Driver Side
- (1) Side Mounting Rail, Passenger Side
- (2) Drain Tubes
- (1) Hardware Bag
4.6
Customer Reviews (8)
Mar 20, 2025
Review shared from UnderCover Armor Flex Tri-Fold Tonneau Cover (24-25 Ranger)
2024 XLT - twistedingeorgia
Installation Time: Less than 1 Hour
Easy to install and looks great
I love this bed cover. It was super easy to install, Works perfect and the bed was 100% dry after running it through the car wash. The only issue i had was with the shipper. Make sure you inspect the package for any holes and dents. My bed cover has a gnarly ding in it, it was only on the underside, so I didn't make a fuss about it as I'm sure ill ding it again at some point myself.
Fit 5/5
Appearance 5/5
Quality 5/5
Bang For Your Buck 5/5
Jul 29, 2024
Review shared from UnderCover Armor Flex Tri-Fold Tonneau Cover (23-25 Canyon)
2024 Elevation - BHilker
Installation Time: Afternoon
Great Cover!
Upgraded to this cover from a soft rollup. Wanted more security. This cover is impressive. Install went smoothly with only minor things to interpret and figure out. Did it solo with no issue. Very pleased with the fit and quality of the cover. Very definitely recommend.
Fit 0/5
Appearance 0/5
Quality 0/5
Bang For Your Buck 0/5
Jan 31, 2024
Review shared from UnderCover Armor Flex Tri-Fold Tonneau Cover (19-22 Sierra 1500 w/ MultiPro Tailgate)
2021 AT4 - Sierra1500AT4
Installation Time: Afternoon
Gets the job done - quality could be better
I went from a diamondback on my last truck to this cover on my new GMC Sierra 1500, simply for the increased bed access and that it doesn't rest on the window/brake light in the open position. I'm pretty disappointed with the overall quality of the rails and cover itself. The hardware is sturdy, but the rails themselves feel flimsy and the cover feels weak. I would not under any circumstances haul anything on top of this cover. The other negative aspect is that the install and fitment is very finicky. I installed by myself because it is so lightweight, and after 2 hours of tinkering with the tightness of the rail clamps the left side of the cover still doesn't shut well. Overall I'm pretty disappointed that I spent over $1200 on this when I could've just ponied up a few more hundred and gotten a diamondback. My expectation is that this will break in a few years and that's the direction I'll go - but for now it's on the truck.
Fit 4/5
Appearance 5/5
Quality 3/5
Bang For Your Buck 2/5
Sep 19, 2021
Review shared from UnderCover Armor Flex Tri-Fold Tonneau Cover (19-25 Silverado 1500 w/ 5.80-Foot Short & 6.50-Foot Standard Box)
2019 Custom Trail Boss - KevinBBQ
Installation Time: Less than 1 Hour
Upgraded Cover
Had a soft trifold cover and it did it’s job but I wanted a more stealth look. After checking out covers I decided on this one. The main reason was when I had it folded all the way up it didn’t rest on the back window. Install was easy for one person but if you have help it’s even better.
Fit 5/5
Appearance 5/5
Quality 5/5
Bang For Your Buck 4/5
Dec 20, 2020
Review shared from UnderCover Armor Flex Tri-Fold Tonneau Cover (14-18 Sierra 1500)
2017 SLT - dant098
Installation Time: Less than 1 Hour
Worth the Extra Money
Bought this over the BakFlip because of the protected surface since I live in an area that gets hail. Great finish, easy to use. Easy to install
Fit 5/5
Appearance 5/5
Quality 5/5
Bang For Your Buck 5/5
Sep 5, 2020
Review shared from UnderCover Armor Flex Tri-Fold Tonneau Cover (19-25 RAM 1500 w/o MultiFunction Tailgate)
2020 Big Horn - AbdulazizAJA
Installation Cost: 0-$100
Installation Time: Shop Install
Armor Flex Box Cover
The cover is a perfect design material for 2020 RAM box.
Fit 5/5
Appearance 5/5
Quality 5/5
Bang For Your Buck 0/5
Jul 25, 2020
Review shared from UnderCover Armor Flex Tri-Fold Tonneau Cover (15-20 F-150)
2020 - plz1
Installation Time: Afternoon
Happy so far
I admit up front, I just installed this. The install video I saw on Youtube recommended using clamps to hold the rails in place while you install the mounts for it. If you don't have a helper, this is an absolute must to get this installed easily. Knowing that, only after I started, this took a while to get installed. A couple other tips: 1. If you have a plastic bed liner, mount the weather stripping to the underside of the short section, instead of to the bed liner. 2. Install the plastic retainer clips to the small section of the cover before mounting it down. I'm rating at 4 stars, as one of the clips that holds the prop rod in place was broken when I opened the box. Not a good sign, but hopefully the manufacturer will replace it without trying to charge me for cheap plastic. If they do, I'll change this rating for sure.
Fit 5/5
Appearance 5/5
Quality 4/5
Bang For Your Buck 5/5
Oct 13, 2019
Review shared from UnderCover Armor Flex Tri-Fold Tonneau Cover (15-20 F-150)
2018 Lariat - JCD
Installation Time: Less than 1 Hour
Happy with this Cover
This is a great looking cover, it is very streamline and fit to the truck. The Armor Flex doesn't get burning hot to the touch even when in the sun and has a shine to it that looks better than the metal and other covers out there. The Line-X coating adds that extra layer of protection and unique look. The cover is good at keeping the water out too. The only improvement I would add is more finished corners at the gate, more for looks than anything else.
Fit 5/5
Reviews of UnderCover Exterior products have an average rating of 4.8 out of 5
Questions & Answers
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Will It Fit My F-250
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- 6.7L V8 Power-Stroke - 17, 18, 19, 20, 21, 22
- 7.3L V8 - 20, 21, 22
