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.
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UnderCover UltraFlex VS BAKflip MX4
Shared Features
Hard Folding Folds toward the truck's bulkhead.- Locks with Tailgate Must unlock and open tailgate to open cover.
- Aluminum Construction Made of corrosion-resistant aluminum.
- Matte Black Finish Matches most OE bed rail caps.
- Dual-Action Tailgate Seal Cover can be shut whether the tailgate is open or closed.
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.
Folds Against Cab
The MX4 folds all the way back against your truck's cab on foam rubber bumpers, ensuring third brake light visibility on short and standard truck beds.
Carpeted Lower Panels
The lower panels of the UltraFlex are lined with a carpet-like material.
Black Lower Panels
The lower panels of the MX4 are finished in black powder coating.
Video
Video
UnderCover UltraFlex Tonneau Cover Product Review on a 2017 Dodge Ram 2500 (01:56)
Video
Video
BAKFlip MX4 Tonneau Cover Features and Benefits (04:08)
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