ShadeMart 10 ft x 21 ft Black Rectangle Sun Shade Sail - UPF50

Our review of the ShadeMart 10 ft x 21 ft Black Rectangle Sun Shade Sail finds it best suited for homeowners and small businesses seeking reliable sun protection and airflow over patios, carports, or poolside areas. The single biggest reason to consider this sail is its combination of heavy-duty woven HDPE fabric and UPF50 sun blocking that cuts sunlight and heat while remaining water permeable, so it reduces temperature without trapping moisture. Installation is straightforward with stainless steel D rings and webbing, making it a practical shade option for outdoor living spaces.

Key Features

• Material: Woven HDPE fabric delivers a durable, tear-resistant surface that stands up to regular outdoor exposure.
• UV Protection: Blocks up to 95% of harmful UV rays, providing strong sun protection and cooler shaded areas.
• Breathability: Water permeable and breathable construction lets rain and air pass through to prevent pooling and improve comfort.
• Hardware Ready: Stainless steel corner D rings attached to heavy duty webbing make anchoring secure and installation simpler.
• Custom Sizing: Available in multiple sizes and customizable options so you can choose a fit for different patios, pergolas, or carports.
• Decorative Styling: Rectangle shape and color choices allow the sail to integrate with existing outdoor decor while providing functional shade.

Who It's For

The ShadeMart rectangle sail is ideal for homeowners who want reliable sun protection over a medium to large outdoor area without creating a waterproof canopy; it works well for patios, carports, poolside seating, and pergolas where airflow and sun blocking matter most. It is also a good match for renters or DIYers who can attach the sail to existing structures like poles, trees, or walls using appropriate hardware kits.

Those who need a fully waterproof cover or a precisely measured commercial installation should look elsewhere; the fabric is purposely water permeable and while custom sizes are offered, manual measurement variance means exact-fit expectations should be tempered.

Pros & Cons

Pros

• Heavy-duty woven HDPE fabric feels durable and resists tearing in normal outdoor use.
• Excellent sun protection with UPF50-level blocking that noticeably lowers heat under the sail.
• Breathable, water permeable design prevents water pooling and improves airflow on hot days.
• Stainless steel D rings and heavy webbing simplify anchoring and provide secure attachment points.

Cons

• Not waterproof, so it will not keep an area dry during rain.
• Size and shape can vary slightly due to manual measurements, which may affect exact fit for some installations.

Specifications

Brand	ShadeMart
Shape	Rectangle
Size	10 ft x 21 ft
Material	Woven HDPE (High Density Polyethylene)
UV Protection	Blocks up to 95% (UPF50)
Water Resistance	Water permeable, not waterproof
Corner Hardware	Stainless steel D rings with heavy duty webbing

Our Verdict

The ShadeMart 10 ft x 21 ft rectangle sail is a practical, good-value choice for anyone wanting strong sun protection, improved comfort, and durable construction without needing a waterproof cover. Its woven HDPE fabric, stainless steel D rings, and breathable design make it especially useful for patios, carports, and pool areas where airflow and UV blocking matter most; just measure carefully and plan for slight manual variances in size.

Frequently Asked Questions

Is this shade sail waterproof?
The fabric is water permeable and breathable, so it is not waterproof and will allow water to pass through.

How much UV protection does it provide?
The sail blocks up to 95% of harmful UV rays and is rated at UPF50 for strong sun protection.

What hardware is included?
The product features stainless steel corner D rings attached to heavy duty white webbing; full mounting kits may be purchased separately depending on installation needs.