ShadeMart 13ft x 21ft Green Sun Shade Sail UPF50 Rectangle - Heavy

In this review the ShadeMart 13' x 21' green rectangle sun shade sail is evaluated for homeowners and small businesses seeking durable, breathable outdoor shade. The biggest reason to consider it is its balance of sun protection and airflow: made from woven HDPE fabric it blocks up to 95% of UV rays while remaining water permeable so heat and moisture do not build up beneath the canopy. The review focuses on real-world use around patios, carports and pools and highlights installation, durability and shading performance.

Key Features

• MATERIAL: Woven HDPE fabric provides a tough, tear-resistant surface that stands up to sun exposure while remaining lightweight for easier mounting.
• UV PROTECTION: The fabric blocks up to 95% of harmful UV rays and sunlight, lowering ambient temperatures by roughly 10 to 15 degrees under the canopy.
• BREATHABLE DESIGN: Water permeable and breathable construction lets rain and air pass through, reducing flapping in wind and preventing water pooling.
• HARDWARE: Stainless steel corner D rings attached to heavy duty webbing create secure anchor points for long-lasting installations.
• CUSTOM SIZE OPTIONS: Multiple custom sizes are offered so the sail can be matched to specific patios, pergolas or carports when measured accurately.
• STYLING: Rectangle shape and color choices make the sail a practical shade solution that also functions as an outdoor design element.

Who It's For

The ShadeMart rectangle sail suits homeowners, renters and small business owners who need large-area sun protection on patios, over pools, carports and pergolas and who prefer a breathable, non-waterproof canopy that reduces heat effectively. It is also useful for seasonal shade where permanent structures are not desired.

Those who need a fully waterproof solution, a perfectly rigid rectangular geometry for precision architectural installs, or who cannot attach hardware to structures should look elsewhere. Also, buyers expecting exact factory-cut dimensions to the fraction of an inch should account for manual measurement variation.

Pros & Cons

Pros

• High UV blocking (up to 95%) that meaningfully lowers temperatures underneath.
• Durable woven HDPE construction and stainless steel D rings for secure long-term use.
• Water permeable fabric prevents pooling and keeps airflow steady in varied weather.
• Custom sizing options and multiple colors allow the sail to fit many outdoor layouts.

Cons

• Not waterproof, so it will not keep out rain for sheltered seating areas.
• Manual sizing can produce slight variations in shape, so careful measurement is required.

Specifications

Brand	ShadeMart
Shape	Rectangle
Size	13 ft x 21 ft
Material	Woven HDPE (High Density Polyethylene)
UV Protection	Blocks up to 95% of UV rays (UPF50)
Water Performance	Water permeable and breathable (not waterproof)
Corner Hardware	Stainless steel D rings on heavy duty webbing

Our Verdict

The ShadeMart 13' x 21' rectangle shade sail is a strong value for anyone who needs large, breathable UV protection without a rigid structure. It delivers effective sun blocking, durable fittings and easy installation for patios, carports and pools, but it is not a replacement for waterproof covers. For most residential outdoor shade needs it is a practical, long-lasting choice when measured and mounted properly.

Frequently Asked Questions

Is this shade sail waterproof?
Answer. No, the fabric is water permeable and breathable and will allow water to pass through rather than shed rain.

Will it reduce temperature under the canopy?
Answer. Yes, the sail blocks up to 95% of UV and typically lowers temperatures underneath by about 10 to 15 degrees.

What attachments are used at the corners?
Answer. Each corner uses stainless steel D rings attached to heavy duty white webbing for secure anchoring.