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Robelle 21 ft Commercial Blue Winter Pool Cover for Above Ground Pools, 4 ft Overlap (25 ft Cover Size), Solid 12 x 12 Scrim, 3.7 oz/yd2, 18-Year Warranty, Style: 3421-4

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Availability: In Stock.
Fulfilled by Amazon

Arrives Wednesday, Sep 9
Order within 23 hours and 56 minutes
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Style: Commercial


Pattern Name: 21-ft. Pool


Features

  • Commercial winter pool cover for 21 ft. round pools. This pool cover has a 4 foot overlap, which is the material included beyond the pool size, making this pool cover easier to install. Since 1973 Robelle has been offering the best pool covers for pool owners. This cover has twice as much overlap as other brands, making it the easiest pool cover to install. Including overlap, the cover size is: 25 feet. Includes winch and cable for easy installation.
  • This Commercial pool cover is constructed with commercial polyethylene that weighs 3.7 ounces per square yard (125 grams per square meter). The material is woven with a 12 x 12 scrim. Scrim is the number of threads per square inch. Material weight and scrim are the best indicators of the overall durability and expected longevity of your pool cover.
  • With over 50 years of experience, Robelle has designed this Commercial winter pool cover with an exceptional focus on quality for this season and years to come. Constructed 85% heavier than industry standard. Backed by a 18-Year Warranty that is the best in the industry. We are real swimming pool experts that are here to help with all of your swimming pool needs.
  • This is a solid winter pool cover that will not allow water to pass through. More pool owners have trusted Robelle for their pool closing needs than any other brand. Exceed your expectations when you choose a Robelle brand pool cover.
  • This pool cover will protect your pool from winter elements throughout the offseason. Designed for superior protection against snow and ice.
  • Use the included winch and cable to secure the cover through the grommets. This pool cover is designed for optimal performance in high wind areas.
  • For pools with decks, install on top of the deck using vinyl water weights, placing them on top of the cover. For pool with partial decks, use water weights on the deck and use the winch and cable around the perimeter running the cable under the deck if possible.
  • Cover should be able to float loosely on the water, consider going up a pool size if you have large top rails.
  • Ice equalizer pillow sold separately

Description

The Robelle Premier Winter Pool Cover is an Commercial-Grade solid winter pool cover. Solid pool covers do not allow water to pass through their material. The Robelle Premier Winter Pool Cover features an Commercial-Grade 12 x 12 scrim. The Commercial-Grade polyethylene material used for this cover weighs 3.7 oz./yd2. Both the scrim count and material weight are the best indicators of the strength and durability for your pool cover. This is an Commercial- Grade pool cover designed to protect your pool from the winter elements. The Robelle Premier Winter Pool Cover features a slate blue topside and a black underside. This pool cover includes a perimeter binding. Please order by your pool size, as the overlap goes beyond the pool size listed. This cover includes a four-foot overlap. If you have a very large top rail, please consider a larger pool size. This cover should be able to comfortably float on the pool water without excessive stress. This cover is not meant to be used as a debris cover during the swimming season. This winter pool cover is intended to be used during the off-season. This cover is meant for traditional above ground pools with a traditional top rail. Includes a winch and cable that should be used to secure your pool cover through the grommets around the perimeter of the pool cover. For extra securing, cover clips and cover wrap (both sold separately) are suggested for pool closing. No other method of installation is recommended. Includes an eighteen year warranty.

Size: 25' (Round)


Color: Blue


Material: 3.26 oz/yd2 Density - 12 x 12 Scrim - Solid Polyethylene (with Nylon Binding)


Brand: Robelle


Product Dimensions: 300"L x 300"W


Brand Name: Robelle


Model Name: Extra Heavy-Duty


Model Number: 3421-4


Global Trade Identification Number: 42


UPC: 034261342142


Manufacturer Warranty Description: 12 years through robelle industries


Item Type Name: 3421-4 Premier Winter Pool Cover for Round Above Ground Swimming Pools


Manufacturer: Robelle


Manufacturer Part Number: 3421-4


Unit Count: 346.36 Square Feet


Installation Type: Floating


Color: Blue


Product Style: Commercial


Shape: Round


Pattern: 21-ft. Pool


Theme: solid


Size: 25' (Round)


Item Dimensions L x W: 300"L x 300"W


Item Weight: 14.5 pounds


Material Type: 3.26 oz/yd2 Density - 12 x 12 Scrim - Solid Polyethylene (with Nylon Binding)


Product Care Instructions: Follow manufacturer guidelines for cleaning, storage, and maintenance to preserve water resistance, UV protection, and overall functionality.


Additional Features: Winter Pool Cover


Closure Type: Winch and Cable


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Wednesday, Sep 9

Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.

To initiate a return, please visit our Returns Center.

View our full returns policy here.

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Top Amazon Reviews


  • Fine for two winters, stayed on, didn't leak
Style: Commercial Pattern Name: 15-ft. Pool
I've only had this for one winter so far. Nothing went wrong. It held up to snowy conditions and freezing temperatures. None of the eyes ripped, no part of the cover itself ripped. Update: It lasted two winters with no rips, but started to get weak after the second winter, so we got rid of it. It's a harsh climate here where the pool freezes solid and we got about two feet of snow on it the second winter, it held up great. The fastening cord and mechanism never broke down. ... show more
Reviewed in the United States on April 25, 2024 by Marigold

  • Buyer Beware
Style: Commercial Pattern Name: 15-ft. Pool
Buyer beware. Second pool cover from this seller. Both covers fell apart in only one season use. I purchased the premier and supreme plus covers. Both failed. The cover material flaked off and the covers deteriorated.
Reviewed in the United States on September 2, 2025 by Little Lebowski

  • OK, not great
Style: Commercial Pattern Name: 15-ft. Pool
An ok, cover, lasted through the first season. Some of the grommets started tearing out and there is obvious strain with any force on them. Seems like they should have had some extra reinforcing material. On the plus side, there was no obvious UV damage, unlike a tarp which was nearby so they got that right. The tiedown system is ok, but in a strong wind it started to come off. Needed to tie it to the sides of the pool at a few points. A big plus was that with the black side up it really heated the water well into fall. With the pump not running, the surface several inches was 108 degrees when the outside air temperature was in the 80s. Once mixed the pool was warm enough to be in much later in the year than last year. ... show more
Reviewed in the United States on November 2, 2022 by gary

  • pool cover warrenty
Style: Commercial Pattern Name: 21-ft. Pool
recieved my cover is the mail and filled out warranty card all set it was registered and now to put the cover on the pool for winter
Reviewed in the United States on September 3, 2025 by Susan A Simon

  • Great quality
Style: Commercial Pattern Name: 21-ft. Pool
The cover itself is extremely well made. I only use covers once and replace every year, with this I may try to get a few years. Only complaint is that the steel cable was about 4 feet short, so i had to use rope which was not great.
Reviewed in the United States on October 9, 2023 by kevin

  • Sadly Another Cheap Cover
Style: Commercial Pattern Name: 21-ft. Pool
After 3 seasons the cover has disentegrated. Very disappointing in this purchase, since their site claims to have a 10+ yr warranty. I've reached out to the company to see what, if anything, they are willing to do to rectify. Will followup if a positive outcome
Reviewed in the United States on June 25, 2025 by Barbara

  • So much better
Style: Commercial Pattern Name: 15-ft. Pool
Love this cover so much better than the one that came with my 15 ft pool. I unboxed it and put it right one the pool. BY MYSELF! So easy to install, thick and durable, sturdy - it stayed where I put it. No sliding around. Winch worked just as described. Using as an everyday cover.
Reviewed in the United States on July 27, 2021 by Katey B

  • Five Stars
Style: Commercial Pattern Name: 15-ft. Pool
Nice product, fast shipping
Reviewed in the United States on November 16, 2016 by Amazon Customer

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