14ft x 21ft Blue Sun Shade Sail UPF50 Rectangle - Cooling Outdoor

In this review the ShadeMart 14' x 21' Blue Sun Shade Sail is evaluated as a practical, heavy-duty shade solution for patios, carports and poolside areas. The bottom line: this woven HDPE rectangle sail is best for homeowners and property managers who need a breathable, UV-blocking canopy that meaningfully reduces temperature and stands up to weather. The sail's UPF50 protection, stainless steel corner D rings and water-permeable weave are the single biggest reasons to consider it for long-term outdoor coverage.

Key Features

• Material: Woven HDPE fabric provides a durable, tear-resistant surface that breathes and lasts through sun exposure.
• UV Protection: Blocks up to 95% of harmful UV rays, helping lower ambient temperature by roughly 10 to 15 degrees under the sail.
• Hardware: Stainless steel corner D rings attached to heavy duty webbing give secure anchor points for proper installation.
• Water Permeable: The breathable design lets water and air pass through, preventing pooling and reducing wind stress on the fabric.
• Custom Size Options: A large selection of custom sizes is available so the sail can be tailored to fit patios, carports, pergolas and pools.
• Styling: Rectangle shape and multiple color choices allow the sail to act as a functional shade and a decorative addition to outdoor spaces.

Who It's For

The ShadeMart rectangle shade sail is aimed at homeowners, landlords and small business owners who need a cost-effective way to add long-lasting shade to outdoor areas like patios, carports, pergolas and pool decks. It is especially suited for sites that benefit from airflow and where water runoff must not collect on the fabric due to its water-permeable construction.

Those who should look elsewhere include buyers who need a fully waterproof canopy or an exact precision-cut rectangle for architectural installations, since manual measurements can yield slight variations in shape even when the fabric area remains constant.

Pros & Cons

Pros

• High-quality woven HDPE fabric offers proven durability and long-term UV resistance.
• Stainless steel D rings and heavy duty webbing provide reliable anchor points for installation.
• Water-permeable construction prevents water pooling and promotes airflow under the sail.
• Custom sizing and multiple colors make it versatile for many outdoor designs.

Cons

• Not waterproof, so it will not keep rain fully out of a covered area.
• Sizes may vary slightly due to manual measurement and the shape may not be a perfect rectangle in all cases.

Specifications

Brand	ShadeMart
Shape	Rectangle
Size	14' x 21'
Material	Woven HDPE (High Density Polyethylene)
UV Rating	UPF50 / blocks up to 95% UV
Hardware	Stainless steel corner D rings with heavy duty webbing
Water Resistance	Water permeable, not waterproof

Our Verdict

The ShadeMart 14' x 21' rectangle shade sail is a solid value for anyone needing breathable, UV-blocking coverage that reduces heat and holds up in harsh sun. It is durable and easy to install with the supplied stainless D rings, and the water-permeable HDPE fabric reduces pooling and wind strain. Choose this sail for patios, carports and pool areas where sun protection and airflow are priorities; pick a different product if you require a fully waterproof canopy or laser-precise dimensions.

Frequently Asked Questions

Is this shade sail waterproof?
Answer. No, the fabric is water permeable and breathable, so it will not keep rain fully out but it prevents pooling.

How much UV protection does it provide?
Answer. The sail offers UPF50 protection and can block up to 95% of harmful UV rays.

Can it be attached to trees, poles or walls?
Answer. Yes, with the proper hardware kits the stainless steel D rings and heavy duty webbing allow attachment to poles, trees, walls, roofs and other structures.