Does the cover have rails inside it to keep it from drooping?

The rails clamp onto the top of the bed and it uses Velcro on port and starboard, the after is a locking system to help keep it taught.. when driving air will get into the sides and make it wave a little but when it's resting as long at you had pulled the Velcro on the sides it will stay taught at rest. There is sealant foam to help with the fore and aft as well as rubber to guud water run off from rain. My super solution was to buy pvc pipe insolation and place it where there are small gaps just in case. I've traveled across country three times through rain and snow , had the tonoe on for 15 months. Nothing has ever gotten wet in my bed and the item is not tearing or showing wear. I trusted it to protect my 6 guitars and childhood toys and it did not let me down with the exrta help I applied. FYI there is no key lock, when it latches in place there's no access to in hinge it from the outside until you open the bed and release it. So if your bed has its open lock then no worries except you can slightly or forcibly maneuver your hands into the bed through the Velcro. Oh and I forgot the cover has three rods that help keep it taught that are apart of the fabric rolling part.

Fits my Colorado perfectly (6 foot bed)

will this fit a 2018 colorado?

It fits my 2017 ZR2, I dont believe any changes were made to the 2018 beds.

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€ 789.42

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Manufacturer	Tonno Pro
Brand	Tonno Pro
Item Weight	26 pounds
Product Dimensions	65 x 25 x 5 inches
Country of Origin	USA
Item model number	42-114
Is Discontinued By Manufacturer	No
Manufacturer Part Number	42-114
OEM Part Number	42-114

Tonno Pro Tonno Fold, Soft Folding Truck Bed Tonneau Cover | 42-114 | Fits 2015-2021 GMC Canyon & Chevrolet Colorado 5' Bed (61.7")

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