ShadeMart 13ft x 21ft Blue Rectangle Sun Shade Sail - UPF50 Protection

In this review the ShadeMart 13' x 21' blue rectangle shade sail is evaluated for homeowners and small-business owners who need practical sun protection without a permanent structure. The bottom line: it is a durable, breathable HDPE fabric canopy that blocks up to 95% of UV while letting water and air pass through, making it ideal for patios, carports and poolside areas. The sail's stainless steel corner D rings and heavy duty webbing give it a robust feel, and many users report a noticeable temperature drop under the fabric.

Key Features

• Material: Woven HDPE fabric provides a strong, tear-resistant surface that stands up to regular outdoor use without trapping heat.
• UV Protection: Blocks up to 95% of harmful UV rays, delivering significant sun protection and lowering temperatures beneath the sail.
• Breathable Design: Water permeable and breathable construction allows rain and air to pass through, reducing wind stress and pooling.
• Hardware Ready: Stainless steel corner D rings attached to heavy duty white webbing make the sail ready to secure to poles, trees, walls or roofs.
• Custom Size Options: Available in custom sizes so you can order a sail that fits nonstandard venues when measured accurately.
• Styling: Rectangle shape with multiple colors to choose from so the canopy can integrate with existing outdoor decor.

Who It's For

This shade sail suits homeowners looking for a semi-permanent shading solution for patios, pergolas, carports or pool areas where airflow and drainage are important. It also fits small businesses that need a durable, attractive canopy for outdoor seating or covered customer areas.

It is not for customers who need a fully waterproof cover or a precisely engineered architectural tension structure; those users should look at waterproof awnings or custom fabricated shade systems. Also measure carefully if you require an exact rectangle, since customers report some variance with manual measurements.

Pros & Cons

Pros

• High-quality woven HDPE fabric feels durable and resists tearing in regular outdoor conditions.
• Effective sun protection with UPF50-level blocking that noticeably reduces heat beneath the sail.
• Breathable and water permeable design prevents water pooling and reduces wind load on attachment points.
• Stainless steel D rings and heavy duty webbing simplify installation to many anchor types.

Cons

• Not waterproof, so it will not keep the area completely dry in heavy rain.
• Some customers report size and shape variance from manual measurement, so precise fit may require careful ordering or custom sizing.

Specifications

Brand	ShadeMart
Size	13' x 21'
Shape	Rectangle
Material	Woven HDPE (High Density Polyethylene)
UV Protection	Blocks up to 95% of UV rays (UPF50)
Hardware	Stainless steel corner D rings, heavy duty white webbing
Water Resistance	Water permeable, not waterproof

Our Verdict

The ShadeMart 13' x 21' rectangle shade sail is a sensible choice for anyone who wants effective UV protection and improved outdoor comfort without a fixed structure; its durable HDPE fabric and stainless hardware offer good value for patios, carports and poolside use. If you need a fully waterproof solution or require absolutely exact dimensions, consider a different product, but for breathable, long-lasting shade this sail performs well.

Frequently Asked Questions

Is this sail waterproof?
Answer. No, the fabric is water permeable and breathable so it will not keep the area fully dry in heavy rain.

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

Will it reduce temperature under the sail?
Answer. Yes, the HDPE fabric blocks up to 95% of UV and customers report a noticeable drop in temperature beneath the sail.