Pool Mate 21 ft Extra Strength Sandstone Winter Pool Cover - 4 ft

In this review the Pool Mate 21 ft Extra Strength Sandstone Winter Pool Cover is evaluated for above ground pool owners who want a heavy-duty, easy-to-install winter cover. The bottom line: this cover is best for people who need a solid, non-permeable winter barrier with extra overlap to simplify installation and withstand snow and ice. The included winch and cable and the four-foot overlap make setup straightforward, while the 12 x 12 scrim and 3.7 oz/yd2 material aim to deliver long lasting protection through the season.

Key Features

• Extra overlap: Four-foot overlap beyond the pool size makes installation easier and helps the cover sit loosely on the water without excessive stress.
• Solid waterproof design: The cover is a solid winter cover that will not allow water to pass through its material, keeping debris and precipitation off the pool.
• Durable construction: Made from extra strength polyethylene at 3.7 oz/yd2 with a 12 x 12 scrim, the material is designed for improved durability and resistance to tearing.
• Included winch and cable: A winch and cable arrive with the cover for securing through grommets and optimizing performance in higher wind areas.
• UV protection: The sandstone topside is coated to help prevent UV damage and extend the cover's useful life.
• Backed warranty: A 15-year warranty provides long-term assurance on manufacturing and material performance.

Who It's For

The Pool Mate 21 ft Extra Strength cover is aimed at above ground pool owners with a roughly 21 ft round pool who want a heavy-duty winter solution that is easy to install. It is particularly suited to those in snowy or icy climates who need a solid, non-permeable cover that resists wind and holds up under winter loads when used with appropriate water bags or ice equalizer pillows.

Owners with very large top rails or unusual pool geometry should consider sizing up, as the cover is designed to float loosely on the water and may be tighter on pools with oversized rails. If you need a seasonal debris cover for regular summer use, this winter-specific cover is not intended for that purpose.

Pros & Cons

Pros

• Extra 4 ft overlap makes installation easier and reduces stress on seams during winter.
• Solid, waterproof material keeps precipitation and debris off the pool through the season.
• Heavy 3.7 oz/yd2 polyethylene with 12 x 12 scrim improves tear resistance and expected longevity.
• Includes winch and cable for secure attachment and better wind performance.

Cons

• Some customers report mixed durability over multiple seasons, so long-term performance can vary by use and care.
• Not designed for use as a summer debris cover or as a substitute for ice equalizer pillows (sold separately).

Specifications

Brand	Pool Mate
Pool size covered	21 ft (cover size 25 ft including 4 ft overlap)
Material weight	3.7 oz/yd2 (125 g/m2)
Scrim	12 x 12 woven scrim
Cover type	Solid winter pool cover (waterproof)
Includes	Winch and cable; grommets for securing
Warranty	15-Year Warranty

Our Verdict

The Pool Mate 21 ft Extra Strength Sandstone cover is a practical choice for above ground pool owners who prioritize a solid, waterproof winter barrier and an easy installation thanks to the four-foot overlap and included winch. While a few users report variable multi-year durability, the heavy 3.7 oz/yd2 material, coated sandstone topside and 15-year warranty make it a sensible value for those protecting a 21 ft pool through harsh winters.

Frequently Asked Questions

Does this cover let water through?
Answer: No, it is a solid winter pool cover designed not to allow water to pass through the material.

Will it fit pools with large top rails?
Answer: It includes 4 ft of overlap but owners with very large top rails should consider going up a pool size to ensure a loose float on the water.

Are ice equalizer pillows included?
Answer: No, ice equalizer pillows are sold separately and are recommended for heavy ice management.