UnderCover UltraFlex VS BAKflip MX4

Two of the most popular hard folding covers available, the UnderCover UltraFlex and the BAKFlip MX4, stand out in the world of hard-folding tonneaus. Built to last in the USA, both tonneau covers offers superior features.

Shared Features

  • Hard FoldingHard Folding Folds toward the truck's bulkhead.
  • Locks with TailgateLocks with Tailgate Must unlock and open tailgate to open cover.
  • Aluminum ConstructionAluminum Construction Made of corrosion-resistant aluminum.
  • Matte Black FinishMatte Black Finish Matches most OE bed rail caps.
  • Dual-Action Tailgate SealDual-Action Tailgate Seal Cover can be shut whether the tailgate is open or closed.
UnderCover UltraFlex
BAKFlip MX4
Folds Against Cab
Folds Against Cab

The UltraFlex folds up to your truck's bulkhead area where it is held straight up in place with prop rods. It does not contact your truck's cab.

Folds Straight Up
Folds Straight Up

The UltraFlex folds up to your truck's bulkhead area where it is held straight up in place with prop rods. It does not contact your truck's cab.

Includes Accessories
Includes Accessories

The UltraFlex is equipped with a bedlight system that increases in-bed visibility in the dark. It also comes with an UnderCover saddle bag, which mounts behind one of your truck's wheel wells for additional storage and cargo management.

BAKBox2 Compatibility
BAKBox2 Compatibility

The MX4 cover is compatible with the BakBox 2 accessory, a toolbox that mounts at your truck's bulkhead. This box can also collapse against your truck's bulkhead when not in use, negating any impact on available bed space.

Carpeted Lower Panels
Carpeted Lower Panels

The lower panels of the UltraFlex are lined with a carpet-like material.

Black Lower Panels
Black Lower Panels

The lower panels of the MX4 are finished in black powder coating.

Five-Year Warranty
Five-Year Warranty

The UltraFlex is back up by a five-year warranty against any manufacturer's defects.

Three-Year Warranty
Three-Year Warranty

The BAKFlip MX4 is backed up by a three-year warranty against any manufacturer's defects.

 
Video
UnderCover UltraFlex Tonneau Cover Product Review on a 2017 Dodge Ram 2500 (01:56)
 
Video
BAKFlip MX4 Tonneau Cover Features and Benefits (04:08)

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