Hard Folding Tonneau Cover for Silverado Sierra HD – Armor Flex 20–25 6ft 10in Matte Black Aluminum

2025-09-05T08:08:52-06:00

Vendor: Undercover
Type: Bed Covers - Folding
Price: 1299.99

Protect your truck bed with a hard folding tonneau cover for Silverado Sierra HD that’s built for heavy-duty performance. The Armor Flex 20–25 6ft 10in cover is engineered for 2020–2025 Chevrolet Silverado and GMC Sierra 2500HD/3500HD models, offering a precise fit and rugged protection.

Crafted from durable aluminum, this hard folding tonneau cover features a low-profile design and a matte black finish that adds a bold, refined look to your truck. With full bed access and a fold-up operation, it’s ideal for hauling tools, equipment, or weekend gear. The flush fit enhances aerodynamics while keeping your cargo secure from the elements.

Installation is straightforward and requires no drilling, taking approximately 45 minutes. It’s not lockable, but it’s built to withstand tough conditions and keep your gear protected. Whether you're working on the job site or heading off-road, this cover delivers the durability and style your HD truck deserves.

Features and Benefits

Hard Folding Aluminum Design – Built tough to withstand harsh conditions and daily use Full Bed Access – Fold-up panels allow complete access when needed Low Profile Style – Sits flush for a sleek, aerodynamic appearance Matte Black Finish – Resists scratches and adds rugged appeal Quick Install – No drilling required; installs in about 45 minutes Specific Fit for 2020–2025 Silverado/Sierra HD – Designed for 6ft 10in beds on 2500HD and 3500HD models

Built for Real-World Demands

From hauling heavy loads in Houston to weekend trails in Montana, this hard folding tonneau cover for Silverado Sierra HD is built to handle whatever life throws at it. It’s the kind of upgrade that works hard, looks sharp, and keeps your cargo secure.

Specifications

Feature | Detail
Part Number | undAX12024
Fitment | 2020–2025 Silverado/Sierra 2500HD/3500HD
Bed Length | 6ft 10in
Material | Aluminum
Finish | Matte Black
Install Time | 45 Minutes
Drilling Required | No
Full Bed Access | Yes
Front Opening | No
Lockable | No
Toolbox Compatible | No
Mounting Hardware | Included
Operation | Fold-Up
Paintable | No
Prop 65 Warning | Yes – Cancer and Reproductive Harm

Installation Instructions
Installation Instructions

This Part Fits:

Year | Make | Model | Submodel
2020-2025 | Chevrolet | Silverado 2500 HD | Custom
2020-2025 | Chevrolet | Silverado 2500 HD | High Country
2020-2025 | Chevrolet | Silverado 2500 HD | LT
2020-2025 | Chevrolet | Silverado 2500 HD | LTZ
2020-2025 | Chevrolet | Silverado 2500 HD | WT
2024-2025 | Chevrolet | Silverado 2500 HD | ZR2
2020-2025 | Chevrolet | Silverado 3500 HD | High Country
2020-2025 | Chevrolet | Silverado 3500 HD | LT
2020-2025 | Chevrolet | Silverado 3500 HD | LTZ
2020-2025 | Chevrolet | Silverado 3500 HD | WT
2020-2025 | GMC | Sierra 2500 HD | AT4
2024-2025 | GMC | Sierra 2500 HD | AT4X
2020-2021 | GMC | Sierra 2500 HD | Base
2020-2025 | GMC | Sierra 2500 HD | Denali
2024-2025 | GMC | Sierra 2500 HD | Denali Ultimate
2022-2025 | GMC | Sierra 2500 HD | Pro
2020-2025 | GMC | Sierra 2500 HD | SLE
2020-2025 | GMC | Sierra 2500 HD | SLT
2020-2025 | GMC | Sierra 3500 HD | AT4
2020-2021 | GMC | Sierra 3500 HD | Base
2020-2025 | GMC | Sierra 3500 HD | Denali
2024-2025 | GMC | Sierra 3500 HD | Denali Ultimate
2022-2025 | GMC | Sierra 3500 HD | Pro
2020-2025 | GMC | Sierra 3500 HD | SLE
2020-2025 | GMC | Sierra 3500 HD | SLT

REVIEWS

JW

This Armor Flex cover is exactly what my Silverado HD needed. It looks clean, installs fast, and gives me full access to the bed. No rattles, no leaks—just solid performance.

James W.

Billings, MT

★★★★★

KH

I’ve had this on my Sierra 3500 for months and it’s held up through rain, snow, and heat. Super easy to use and the matte black finish still looks brand new.

Karen H.

Spokane, WA

★★★★★