Best Polyester Covers in 2026
Daisy
Last Updated: Jul 17, 2026
Daisy
Last Updated: Jul 17, 2026
* PickSmartly editors independently research, review, and endorse the top products through comprehensive data analysis. We may earn a commission for qualifying purchases made through our product links.
| SELLER | SELLER SCORE | AMAZON FULFILLED | PRIME | FREE SHIPPING |
|---|---|---|---|---|
| Truck Upfitters | 9.84 | ✅ | ✅ | ✅ |
CHECK YOUR LENGTHS AND PRESSURE BEFORE ORDERING. THESE ARE NOT COMPATIBLE WITH ALL PLASTIC TONNEAU COVERS! THE MEASUREMENTS ARE FROM CENTER OF BALL MOUNT TO CENTER OF BALL MOUNT, NOT FROM END TO END OF STRUT! SEE PICTURE!
Truck Upfitters Pair of 38 pound gas struts. 27.5" extended length and 15.6" compressed length (measured from center of each ball mount). 29" overall extended length (measured from tip to tip). Use a measuring tape to measure the door gas strut that you are replacing. Measure from the CENTER of the gas prop head (little plastic end), to the other side. DO NOT measure from the end of the gas prop, your measurement will be too long. Note that most applications allow for 1-5% size variation.
These undercover bed cover shocks do not match all tonneau cover struts and are only compatible with undercover pickup bed cover. If you are not sure of the fit, measure your gas strut lift support from center of socket to center of socket when fully opened & fully closed to get accurate measurement. Please see pictures to determine how to measure gas springs. Do NOT measure from end to end. Measurement must be from the center of plastic ball mount on each end of the gas spring lift.
Equivalent to # GPSt270P or Stabilus # 0518. Fits all SE/Classic/Elite Undercover truck bed covers except for Ford Sporttrac Undercover. Will NOT FIT ANY FIBERGLASS tonneau covers. Comes with four 10mm ball mounts for alternate 'other than truck camper shell' applications. These gas shock lift supports CANNOT be compressed by hand. They MUST be installed in the EXTENDED / OPEN position. Do NOT try to install them in the CLOSED position. Refer to the install video for guidance on how to install.
These undercover replacement parts are compatible with undercover tonneau cover parts only! Although they may fit other brands, we have ONLY tested these undercover bed cover parts to be compatible with Undercover parts only. When you are performing an undercover lock replacement or swapping out other undercover truck bed cover parts, it's a good idea to also replace the gas support strut / tonneau cover shocks as well! These gas lift support are strong an durable, and last up to 5 years.
| SELLER | SELLER SCORE | AMAZON FULFILLED | PRIME | FREE SHIPPING |
|---|---|---|---|---|
| Amazon.com | 9.68 | ✅ | ✅ | ✅ |
Fits 1999 - 2014 Ford F-150 Passenger Side
TRUCK BED COVER COMPATIBLE ; The UnderCover SwingCase maintains a 3-inch clearance from the truck bed and works with virtually all tonneau covers: soft, hard, folding, and rolling
ULTIMATE ACCESSIBILITY ; This toolbox swings out nearly 180° towards you for easy access from the tailgate and swings back into a locking position over the wheel well for maximum bed access
SECURE STORAGE SOLUTION ; The SwingCase has a key-lockable lid and can hold up to 75 lbs. of cargo. It features an organizational tray, as well as a moisture seal to help keep contents dry and protected against the elements
Will NOT fit 00-03 (04 Heritage) F-150 SuperCrew.NOTE: Will NOT fit Flareside models
| SELLER | SELLER SCORE | AMAZON FULFILLED | PRIME | FREE SHIPPING |
|---|---|---|---|---|
| Parts Via | 9.46 | ❌ | ❌ | ❌ |
Fits 2019 - 2021 Chevrolet Silverado/GMC Sierra 1500 (does not fit Carbon Bed) 5' 10" Bed (70")
ULTIMATE DURABILITY The ArmorFlex hard folding cover has durable, matte-finished aluminum panels with a patented LINE-X coating to help prevent dents, dings, & scratches for superior protection in extreme environments.
ENHANCED SECURITY & FUNCTIONALITY This cover’s automatic latching system locks each panel in place with releases on either side of the bed for easy operation. Its dual-action tailgate seal allows you to shut the tailgate without lifting the cover first.
100% BED ACCESS The ArmorFlex allows you to drive with the cover in three secure positions: closed, partially closed, & fully open. The cover folds into an upright position with dual prop rods, without resting on the back of the cab.
PURCHASE WITH CONFIDENCE The UnderCover ArmorFlex hard fold is lightweight and easy to install. It comes with a 5-year, hassle-free guarantee and is proudly made in the USA with globally sourced matierals with a US-based customer support team.
| SELLER | SELLER SCORE | AMAZON FULFILLED | PRIME | FREE SHIPPING |
|---|---|---|---|---|
| Amazon.com | 9.68 | ✅ | ✅ | ✅ |
Strong nylon pull strap assists you in closing the cover, very helpful on taller trucks
Secure, versatile and weatherproof twist locks allow you to open your undercover with or without your key
Standard no-drill concealed clamp bracket system makes installation very easy
The Undercover is a full perimeter seal and gives a perfect fit, your valuables will be protected from all the elements
Wall mount hardware is included with every undercover to keep your garage clutter free and your cover protected, sleek styled contour custom fit
Here is the list of top-rated brands that were evaluated by PM.
| Brand | Count |
|---|---|
| Undercover | 63 |
| Truck Upfitters | 1 |
We've carried out a comprehensive analysis of 12,317 reviews on covers, using our selection criteria to identify the best options in the categories. Our findings reveal that most customers typically select covers priced around $1,223.56, with top brands including and
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