Installation Time
(approx) 30 Minutes
Difficulty Level:
Simple installation for anyone.
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UnderCover Armor Flex Tri-Fold Tonneau Cover (20-24 Sierra 3500 HD)
Item SHG1975
Sierra 3500 Sales Techs:
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M-F 8:30A-11P, Sat-Sun 8:30A-9P
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Our Price
$1,149.99 - $1,199.99 (each)
FREE Shipping + $199.00 Oversized Item Fee Market Price $1,520.99 You Save 24% ($371.00) Up to 10% off for Military & First Responders! See DetailsWill this fit your Vehicle?
Ship to: Columbus - 43215
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Product Information
Features, Description, Reviews, Q&A, Specs & Installation
Features & Specs
- To Learn How to Measure Your Bed Click Here
- Tri-Fold Hard Tonneau Cover
- Versatile Truck Bed Protection
- Buckle and Strap Secures Folded While Driving
- Heavy-Duty FRP (Fiberglass Reinforced Polymer) Panels
- Line-X® Automotive Coated Surfaces Prevents Scruffs and Dents
- Dual Action Tailgate Seals
- Clamp-On Installation
- Backed by a 5-Year Warranty
- Made in the USA
- Fits 2020-2024 Sierra 3500 HD Models
| 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
Solid Cargo Protection. Prevent theft and protect your cargo from the sun, snow, and rain with the UnderCover Armor Flex Tri-Fold Tonneau Cover. This tri-fold cover features the Line-X® automotive coating that protects your tonneau cover from scratches, dents, and abrasions. This makes for a great investment that you’ll be using for years.
Aerodynamic Low Profile. If you’re one of those truckers who want to preserve their truck’s clean lines, then this is the perfect tonneau cover for you. The UnderCover Armor Flex Tri-Fold Tonneau Cover is mounted flat against your truck’s bed rails for that sleek and aerodynamic look. Not only will this cover provide protection, it will also improve the look of your truck.
Weatherproofed Construction. Engineers at UnderCover Armor spent countless hours to perfect the design of this tri-fold bed cover. With its fiberglass reinforced polymer panels and Line-X® Automotive Coating, they’ve succeeded in developing a tonneau cover that will last for a very long time.
Quick and Easy Installation. The UnderCover Armor Flex Tri-Fold Tonneau Cover comes with everything you need for the installation including hardware and the drain tube that will keep water away from the truck bed. With a few basic tools and about 30 minutes of free time, you’ll be able to complete the assembly and installation.
UnderCover’s Manufacturer’s Warranty. The UnderCover Armor Flex Tri-Fold Tonneau Cover is warranted against manufacturing defects including materials and workmanship issues for five years. However, damages resulting from accidents, installation mistakes, neglect, and modifications will not be covered.
Application. The UnderCover Armor Flex Tri-Fold Tonneau Cover fits 2020-2024 Sierra 3500 HD models.
Technical Note. Not sure of your bed size? Click here for an instructional video explaining how to measure your bed length.
Fitment:
- 2020 GMC Sierra 3500
- 2021 GMC Sierra 3500
- 2022 GMC Sierra 3500
- 2023 GMC Sierra 3500
- 2024 GMC Sierra 3500
UnderCover AX12024
AX12026
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) Cover Assembly
- (2) Rails
- (1) Drain Tube
- Installation Hardware
4.5
Customer Reviews (6)
Reviews of UnderCover Exterior products have an average rating of 4.8 out of 5
Questions & Answers
10 More Questions
Will It Fit My Sierra 3500
- 6.6L V8 - 20, 21, 22, 23, 24
- 6.6L V8 Duramax - 20, 21, 22, 23, 24
