Undercover Flex - FX11018 (Image)
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UnderCover Flex - FX11018 - 2014-2018 Chevrolet Silverado / GMC Sierra (2019 Classic) - 5.8 ft. Bed

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Vehicle Specific
2399   – Reward Points
  • $1199.99

STYLE: Hard Fold Up Tonneau Cover
  • Easy clamp on installation
  • Aluminum panels
  • Stands behind the cab for total bed access
Select your vehicle

UnderCover Flex - Logo


UnderCover Flex - Main Image


The UnderCover Flex is a hard folding truck bed cover that gives you the ultimate control of your truck bed, offering three secure riding positions. The cover is easy to remove, requires no drilling for installation, and is mounted flush with your trucks bed rails making it the most watertight hard folding cover on the market. The Flex is constructed with heavy-duty FRP panels providing more strength, durability and dent resistance than aluminum panels.


Each Flex has a bed rail mounting system equipped with rubber seals and drain tubes that carry water away from and out of the bed, keeping your gear dry and secure. The Flex is backed by a 3-year warranty making it America's favorite hard folding tonneau cover.


  • Low-Profile Design
  • 100% Bed Access
  • FRP Top Skin Panels
  • Weather Resistant
  • Three Secure Driving Positions
  • Heavy-Duty Construction
  • Easy, No-Drill Install
  • UV Protective Black Finish
  • Made in the USA


UnderCover Flex - Full Bed Access
Full Bed Access


Built-in prop rods secure the cover allowing your truck to be driven with the cover fully open.


UnderCover Flex - Weather Resistant
Weather Resistant


Rubber seals and drain tubes channel water away from and out of the bed.


UnderCover Flex - Heavy Duty Construction
Heavy Duty Construction


The Flex is constructed with heavy-duty FRP panels providing more strength, durability and dent resistance than aluminum panels.


UnderCover Flex - Simple Operation
Simple Operation


Easy-to-use slam latches are mounted on both sides of the cover, allowing the cover to be opened from either side of the truck.
  • Fitment Type
    Vehicle Specific
Year Make Model Bed Length
2014 GMC Sierra 1500 Crew Cab - 5.8 ft. Bed
2014 Chevrolet Silverado 1500 Crew Cab - 5.8 ft. Bed
2015 GMC Sierra 1500 Crew Cab - 5.8 ft. Bed
2015 Chevrolet Silverado 1500 Crew Cab - 5.8 ft. Bed
2016 GMC Sierra 1500 Crew Cab - 5.8 ft. Bed
2016 Chevrolet Silverado 1500 Crew Cab - 5.8 ft. Bed
2017 GMC Sierra 1500 Crew Cab - 5.8 ft. Bed
2017 Chevrolet Silverado 1500 Crew Cab - 5.8 ft. Bed
2018 GMC Sierra 1500 Crew Cab - 5.8 ft. Bed
2018 Chevrolet Silverado 1500 Crew Cab - 5.8 ft. Bed
2019 GMC Sierra 1500 Limited / Old Body Style Crew Cab - 5.8 ft. Bed
2019 Chevrolet Silverado 1500 LD / Old Body Style Crew Cab - 5.8 ft. Bed
exclaimptSmall.gifProp 65 WARNING


Prop 65 WARNING: This product can expose you to chemicals known to the State of California to cause cancer and/or birth defects or other reproductive harm.  For more information go to www.P65Warnings.ca.gov. 

    • SKU
      FX11018
    • UPC/ISBN
      897197006591
  • Style
    Hard Fold Up
  • Keystone Inventory Tracking
    Yes
  • Keystone Brand ID
    U19
  • Brand
    Undercover
  • Model
    Undercover - Flex
  • Warranty
    3 Years
  • Installation Type
    Clamp On
  • Locking
    Lockable Using Tailgate handle
  • Drilling Required
    Yes (Drain tubes only)
  • Cover Side Fasten Style
    Not Applicable
  • Works With Tool Box
    No
  • Works with Bed Rails
    No
  • Hinged
    Yes
  • Bed Length
    5.8 Ft. (69.3 In.)
  • Product Type
    Tonneau Covers
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