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UnderCover UX12018 Ultra Flex Hard Folding Tonneau Cover Chevrolet Silverado/GMC Sierra 1500 14-18 5'8"
- UX12018
| Brand | UnderCover |
| T-Slot Rails | No |
| Material Type | Hard |
| Box Weight | 69 lbs |
| Box Length | 81 in |
| Box Width | 31 in |
| Box Height | 8.5 in |
| UPCCode | 816391020837 |
Please select your vehicle to ensure that this product fits.
The Ultra Flex Tonneau Cover from UnderCover® and RealTruck® resides in a league of its own. The premium, hard folding truck bed cover offers an overwhelming feature list. From the irresistible outward appearance to each component beneath the cover, the carefully crafted Ultra Flex is the ultimate all-purpose truck bed cover.
This high-end, hard-folding tonneau cover is manufactured from only the best materials, including matte-black-coated aluminum top panels and L-Rails. The rigid yet lightweight aluminum panel construction can withstand up to 400 pounds of evenly distributed weight. This truck bed cover is also highly durable and theft-proof—with the tailgate locked, your cargo in the bed is safer than if it were in the cab.
The UnderCover Ultra Flex Tonneau Cover is as resistant to inclement weather as it is to theft. UnderCover utilizes a sleek, low-profile design with automatic slam latches, pressing the cover tightly against the integrated EPDM rubber perimeter seals and dual-action tailgate seal to keep water out.
Operating the UnderCover Ultra Flex Tonneau Cover is quick and easy. To release the cover, drop the tailgate, pull the latches near the rear of the bed, and fold it toward the bulkhead. You can either secure the cover in the ⅔ open position using the integrated safety straps or fold it flat against the rear window and support it upright with the built-in prop rods, offering full bed access.
Closing the cover is just as easy—simply fold it back toward the tailgate as the cover’s innovative slam latches automatically engage, locking each panel into the redesigned L-Rails. The cover’s dual-action tailgate seal allows you to operate the tailgate whether the tonneau cover is opened or closed.
- Premium hard-folding tonneau cover
- Easy-to-use tri-fold design
- Durable yet lightweight aluminum-skinned panels
- Alluring matte-black smooth finish
- Flush, low-profile design
- Carpeted under panels
- Integrated prop rods allow full bed access while driving
- EPDM rubber hinges, perimeter seals, and dual-action tailgate seal
- Integrated drain channels and tubes
- Simple no-drill installation with clamp-on L-Rail system
- Automatic slam latches
- 400-lb. weight capacity (evenly-distributed)
- 5-year warranty
| Brand | UnderCover |
| Material | Aluminum |
| T-Slot Rails | No |
| Material Type | Hard |
| Series | Ultra Flex |
| Submodel | 5'8" Bed |
| Type Cover | Hard Folding |
| Color | Matte Black |
| Fitment | 2014 Chevrolet Silverado 1500, 2015 Chevrolet Silverado 1500, 2016 Chevrolet Silverado 1500, 2017 Chevrolet Silverado 1500, 2018 Chevrolet Silverado 1500, 2014 GMC Sierra 1500, 2015 GMC Sierra 1500, 2016 GMC Sierra 1500, 2017 GMC Sierra 1500, 2018 GMC Sierra 1500 |
| Box Weight | 69 lbs |
| Box Length | 81 in |
| Box Width | 31 in |
| Box Height | 8.5 in |
| UPCCode | 816391020837 |
| Brand | UnderCover |
| Material | Aluminum |
| T-Slot Rails | No |
| Material Type | Hard |
| Series | Ultra Flex |
| Submodel | 5'8" Bed |
| Type Cover | Hard Folding |
| Color | Matte Black |
| Fitment | 2014 Chevrolet Silverado 1500, 2015 Chevrolet Silverado 1500, 2016 Chevrolet Silverado 1500, 2017 Chevrolet Silverado 1500, 2018 Chevrolet Silverado 1500, 2014 GMC Sierra 1500, 2015 GMC Sierra 1500, 2016 GMC Sierra 1500, 2017 GMC Sierra 1500, 2018 GMC Sierra 1500 |
| Box Weight | 69 lbs |
| Box Length | 81 in |
| Box Width | 31 in |
| Box Height | 8.5 in |
| UPCCode | 816391020837 |
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.
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