UnderCover FX11019 Flex Hard Folding Tonneau Cover Chevrolet Silverado/GMC Sierra 1500/2500/3500 14-19 6'6"
For ultimate cargo protection, you can’t beat a rugged, hard tri-fold bed cover, like the UnderCover® Flex from RealTruck®. The premium truck bed cover offers a robust and secure hard-shell construction, easy-to-use folding design, low-profile aesthetic, and exceptional weather resistance, protecting your truck bed in all conditions.
The UnderCover Flex Tonneau Cover features rigid yet lightweight aluminum panel construction for superior durability. These panels are impact, abrasion, and cut-resistant—they can even support up to 400 pounds when evenly distributed. UnderCover treats the Flex Tonneau Cover with a durable gloss-black coating for superior corrosion resistance and sleek styling.
Accessing your truck’s cargo area is simple and quick—simply drop the tailgate, pull either of the cover’s release cables, and fold the cover onto itself toward the bulkhead. You can secure the cover in the ⅔ open position with the integrated safety straps or fold it flush against the rear window, securing it with built-in prop rods for 100-percent bed access. When you’re finished loading or unloading, close the tonneau cover, fasten and lock the tailgate, and your cargo in the bed is safer than your cargo in the cab. Installing the UnderCover Flex is just as easy using UnderCover’s clamp-on mounting system.
The UnderCover Flex is just as resistant to inclement weather as it is to theft. The tonneau cover’s EPDM rubber hinges, perimeter seals, and dual-action tailgate seal prevent moisture from seeping into the bed. Any water that slips past the side seals gets diverted through built-in water channels and out of integrated drain tubes, keeping your cargo dry.
- Premium hard-folding tonneau cover
- Easy-to-use tri-fold design
- Durable yet lightweight aluminum-skinned panels
- Corrosion-resistant gloss-black textured finish
- Flush, low-profile design
- EPDM rubber hinges, perimeter seals, and dual-action tailgate seal
- Integrated drain channels and tubes
- Offers complete full bed access when folded flush against the cab
- Simple no-drill installation
- 400-lb. weight rating (evenly distributed)
- Limited 3-year warranty
Brand | UnderCover |
Material | Aluminum |
Note | Legacy/Limited (2018 Body Style) |
T-Slot Rails | No |
Material Type | Hard |
Series | Flex |
Submodel | 6'6" Bed |
Type Cover | Hard Folding |
Color | Gloss Black |
Fitment | 2014 Chevrolet Silverado 1500, 2015 Chevrolet Silverado 1500, 2016 Chevrolet Silverado 1500, 2017 Chevrolet Silverado 1500, 2018 Chevrolet Silverado 1500, 2019 Chevrolet Silverado 1500, 2014 GMC Sierra 1500, 2015 GMC Sierra 1500, 2016 GMC Sierra 1500, 2017 GMC Sierra 1500, 2018 GMC Sierra 1500, 2019 GMC Sierra 1500, 2015 Chevrolet Silverado 2500, 2016 Chevrolet Silverado 2500, 2017 Chevrolet Silverado 2500, 2018 Chevrolet Silverado 2500, 2019 Chevrolet Silverado 2500, 2015 Chevrolet Silverado 3500, 2016 Chevrolet Silverado 3500, 2017 Chevrolet Silverado 3500, 2018 Chevrolet Silverado 3500, 2019 Chevrolet Silverado 3500, 2015 GMC Sierra 2500, 2016 GMC Sierra 2500, 2017 GMC Sierra 2500, 2018 GMC Sierra 2500, 2019 GMC Sierra 2500, 2015 GMC Sierra 3500, 2016 GMC Sierra 3500, 2017 GMC Sierra 3500, 2018 GMC Sierra 3500, 2019 GMC Sierra 3500 |
Box Weight | 70 lbs |
Box Length | 82 in |
Box Width | 32 in |
Box Height | 8 in |
UPCCode | 897197006607 |
Brand | UnderCover |
Material | Aluminum |
Note | Legacy/Limited (2018 Body Style) |
T-Slot Rails | No |
Material Type | Hard |
Series | Flex |
Submodel | 6'6" Bed |
Type Cover | Hard Folding |
Color | Gloss Black |
Fitment | 2014 Chevrolet Silverado 1500, 2015 Chevrolet Silverado 1500, 2016 Chevrolet Silverado 1500, 2017 Chevrolet Silverado 1500, 2018 Chevrolet Silverado 1500, 2019 Chevrolet Silverado 1500, 2014 GMC Sierra 1500, 2015 GMC Sierra 1500, 2016 GMC Sierra 1500, 2017 GMC Sierra 1500, 2018 GMC Sierra 1500, 2019 GMC Sierra 1500, 2015 Chevrolet Silverado 2500, 2016 Chevrolet Silverado 2500, 2017 Chevrolet Silverado 2500, 2018 Chevrolet Silverado 2500, 2019 Chevrolet Silverado 2500, 2015 Chevrolet Silverado 3500, 2016 Chevrolet Silverado 3500, 2017 Chevrolet Silverado 3500, 2018 Chevrolet Silverado 3500, 2019 Chevrolet Silverado 3500, 2015 GMC Sierra 2500, 2016 GMC Sierra 2500, 2017 GMC Sierra 2500, 2018 GMC Sierra 2500, 2019 GMC Sierra 2500, 2015 GMC Sierra 3500, 2016 GMC Sierra 3500, 2017 GMC Sierra 3500, 2018 GMC Sierra 3500, 2019 GMC Sierra 3500 |
Box Weight | 70 lbs |
Box Length | 82 in |
Box Width | 32 in |
Box Height | 8 in |
UPCCode | 897197006607 |
Warranty Information
1. UnderCover Ultra Flex
Warranty: Lifetime on the frame, 5 years on components.
Conditions: Applies only to the original owner with purchase from an authorized dealer. Not valid for transfer or reinstalling on another vehicle.
Limitations: Does not cover improper installation, accidents, misuse, or chemical damage.
Repair/Replacement: Upon evidence of defect, the manufacturer will decide on repair or replacement.
2. UnderCover SE
Warranty: Lifetime on the body, 1 year on hardware and lift mechanisms.
Conditions: Valid only for the first purchaser with proof of purchase and standard installation.
Limitations: No coverage for misuse, modifications, or negligence.
Repair: Through authorized service only. Transportation costs are not covered.
3. UnderCover LUX
Warranty: Lifetime on structure and factory paint.
Conditions: Only for the first owner and initial installation.
Limitations: Invalid if painted outside the factory, improper use, aggressive cleaners, or environmental damage.
Care: Clean regularly with automotive-safe products.
Repair: Decision made after condition assessment.
4. UnderCover Flex
Warranty: Lifetime on core structure, 5 years on other parts.
Conditions: Covers only original purchaser through authorized dealers.
Limitations: Not warranted against damage from misuse or external elements.
Repair: Performed through official service channels if needed.
5. UnderCover Elite
Warranty: Lifetime on ABS body, 1 year on lift parts and hardware.
Conditions: Valid for original owner with receipt.
Limitations: Excludes improper installation, driving with lid open, unauthorized modifications, or environmental/chemical damage.
Repair: Through official channels; shipping at owner's cost.
Note: Remove cover when transporting oversized items.
6. UnderCover Elite LX
Warranty: Lifetime on structure and factory paint, 1 year on hardware.
Conditions: Only valid for the original owner and first installation.
Limitations: Not covered if repainted, used open, or exposed to aggressive substances.
Care: Use only safe products for plastic and paint.
Repair: Manufacturer decides based on defect evidence.
7. UnderCover SwingCase
Warranty: 1 year on the entire product, including body, locks, hinges, and hardware.
Conditions: Valid from purchase date for original buyer with receipt.
Limitations: No coverage for installation errors, negligence, chemical or mechanical damage.
Care: Clean only with plastic-safe products.
Repair: Repair or replacement available via seller upon manufacturer approval.
How to Submit a Warranty Claim
If a defect is discovered during the warranty period, the product may be returned to the place of purchase, subject to prior approval. Unauthorized returns will not be accepted.
Provide the following:- Order number
- Full name, address, phone number, email
- Vehicle year, make, and model
- Product name or part number
- Description of the issue
- Copy of original receipt
- Photos showing the defect
All claims will be reviewed only upon submission of a complete data package and proof of defect.