Talk to a Sierra 2500 Sales Tech
M-F 8:30A-11P, Sat-Sun 8:30A-9P
$12k Summer Sweepstakes! Enter Daily>

UnderCover Flex Tri-Fold Tonneau Cover; Black Textured (20-24 Sierra 2500 HD)

Item HG2094
UnderCover Flex Tri-Fold Tonneau Cover; Black Textured (20-24 Sierra 2500 HD)
Verify parts fit and get product recommendations.
Sierra 2500 Sales Techs: Connect Now M-F 8:30A-11P, Sat-Sun 8:30A-9P
Our Price

$1,099.99 - $1,149.99 each

Up to 10% off for Military & First Responders! See Details

Ship to: Ashburn - 20149
Sorry, please enter a valid US or CA postal code
We're sorry, zip can't be updated at this time.

Will this fit your Vehicle?

Select a different vehicle Help?
Update or Change Vehicle
    Create a list
    Add to New List

    Saved - View your saved items

    We're sorry. We couldn't save this product at this time.

      Product Information

      Features, Description, Reviews, Q&A, Specs & Installation

      Features & Specs

      • To Learn How to Measure Your Bed Click Here
      • Tri-Fold Tonneau Cover
      • Slam Latch System
      • Heavy-Duty FRP Panel Construction
      • Black Finish with UV Protection
      • Flush-Mounted Installation
      • Three-Year Warranty
      • Fits 2020-2024 Sierra 2500 HD Models


      Create a Covered Storage Bed. With the black textured UnderCover Flex Tri-Fold Tonneau Cover, you can create an enclosed storage area for your Sierra that is protected from the elements and uninvited guests. The slam latch system installs on both sides of the truck bed for easy operation. The built-in prop rods let you drive with the cover fully open, or you can have it fully extended for an almost completely watertight fit.

      Classic Tri-Fold Design. While the tri-fold design gives your Sierra a classic look, it is packed full of modern security features. The slam latch system gives you an access point from either side of the truck bed. The bed rail mounting system comes with drains and tubes that carry water away from the cargo area, letting you haul even in heavy rains.

      Surprisingly Durable Construction. Made from a fiberglass reinforced plastic (FRP), this tonneau cover is actually more impact resistant than a comparable aluminum build. The black textured finish helps block UV rays, so items stored in your truck bed stay safe from most environmental agents.

      Quick Installation. Installing this tonneau cover is quick, easy and only requires the use of a socket wrench. The side rails come pre-assembled to make the process even easier.

      Three-Year Warranty. Every UnderCover product comes with a 3-year warranty that protects against damage due to defects in material or workmanship. Exclusions may apply, so check the manufacturer's warranty for more information.

      Application. The UnderCover Flex Tri-Fold Tonneau Cover with a black textured finish installs easily on all 2020-2024 Sierra 2500 HD trucks.

      Technical Note. Not sure of your bed size? Click here for an instructional video explaining how to measure your bed length.


      • 2020 GMC Sierra 2500
      • 2021 GMC Sierra 2500
      • 2022 GMC Sierra 2500
      • 2023 GMC Sierra 2500
      • 2024 GMC Sierra 2500

      UnderCover FX11024


      CA Residents: WARNING: Cancer and Reproductive Harm -

      Installation & What's in the Box

      Installation Info

      What's in the Box

      • (1) Tri-Fold Cover
      • (1) Left Side Mounting Rail
      • (1) Right Side Mounting Rail
      • (2) Drain Tubes
      • Installation Hardware

      Customer Reviews (55)

        Questions & Answers

        10 More Questions

        Will It Fit My Sierra 2500

        • 6.6L V8 - 20, 21, 22, 23, 24
        • 6.6L V8 Duramax - 20, 21, 22, 23, 24