2020-2025
2015-2019
2007-2014
Installation Time
(approx) 15 Minutes
Difficulty Level:
Simple installation for anyone.
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Find Bed Covers & Tonneau Covers for your Sierra 3500
UnderCover Ultra Flex Tri-Fold Tonneau Cover; Black Textured (20-25 Sierra 3500 HD)Find parts that fit my vehicle
Item SHG1991
Sierra 3500 Sales Techs:
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M-F 8:30A-11P, Sat-Sun 8:30A-9P
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13 Reviews
Our Price
$1,199.99 - $1,249.99 each
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Product Information
Features, Description, Reviews, Q&A, Specs & Installation
Features & Specs
- To Learn How to Measure Your Bed Click Here
- Ultra Flex Tri-Fold Tonneau cover
- Protects Truck Bed and Cargo
- Stylish Black Textured Finishing
- Superior Quality Construction
- Simple and Quick Installation for Anyone
- Five-Year Limited Warranty
- Fits All 2020-2025 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
Brilliant Styling. Improve the looks and protection of your Sierra bed by installing this UnderCover Ultra Flex Tri-Fold Tonneau Cover with Black Textured finish. This tonneau cover has been designed to perfectly fit your Sierra without need for any modification. This truck bed cover will give you confidence knowing that your cargo and truck bed is secure, irrespective of the off-road conditions that you are maneuvering.
Sturdy Construction. Undercover manufactures their Ultra Flex Tri-Fold Tonneau Cover using FRP composite panels that are extremely robust, yet lightweight. This strong construction is resistant to denting, fading, and scratches and will last for several years. The black textured finish improves the look of the truck bed cover and blends perfectly with most color schemes.
Direct Bolt-On Installation. If you are looking for a truck bed cover that is easy to install, then the Undercover Ultra Flex Tri-Fold Tonneau Cover is the best in the market. All you need to mount it is a 9/16 wrench and 15 minutes of your time. Flex Covers do not need any drilling.
Five-Year Warranty. Undercover provides a 5-year warranty to all original buyers who acquire this Ultra Flex Tri-Fold Tonneau Cover. This ensures that any defects in manufacturing or material in this truck bed cover are covered. The guarantee is non transferable and one should check out the terms and conditions for peace of mind.
Application. The UnderCover Ultra Flex Tri-Fold Tonneau Cover with Black Textured finishing is engineered to be a custom fit for the truck beds of all 2020-2025 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
- 2025 GMC Sierra 3500
UnderCover UX12024
UX12026
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) Driver Side Rail, Pre-Assembled
- (1) Passenger Side Rail, Pre-Assembled
- (2) Drain Tubes
- Mounting Hardware
4.8
Customer Reviews (13)
Questions & Answers
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Will It Fit My Sierra 3500
- 6.6L V8 - 20, 21, 22, 23, 24, 25
- 6.6L V8 Duramax - 20, 21, 22, 23, 24, 25
