ShadeMart 16 ft x 21 ft Turquoise Rectangle Sun Shade Sail - UPF50

In this review of the ShadeMart 16' x 21' Turquoise Sun Shade Sail the bottom line is simple: this sizeable rectangle sail is best for homeowners and small businesses that need durable, breathable UV protection over patios, carports and pools. The strongest reason to buy is the fabric - woven HDPE that blocks up to 95% of harmful UV while remaining water permeable, so it lowers temperatures noticeably without trapping rain. Installation is straightforward for anyone comfortable with basic hardware, and customers repeatedly praise its quality and cooling effect.

Key Features

• Material: Woven HDPE construction provides long-lasting fabric strength and resists common outdoor wear so the sail holds shape and shade season after season.
• UV protection: Rated UPF50 and able to block as much as 95% of sunlight, the sail significantly reduces sun exposure and lowers surface temperatures under the canopy.
• Breathable design: The water and air permeable cloth allows rain and wind to pass through, preventing pooling and reducing wind load compared with solid canopies.
• Hardware ready: Stainless steel D rings attached to heavy duty white webbing provide secure anchor points and simplify attachment to poles, trees, walls or roofs with proper kits.
• Custom sizing: A range of custom sizes is available so buyers can match odd or large spaces; measure carefully because dimensions may vary slightly by manual measurement.

Who It's For

The ShadeMart 16' x 21' rectangle sail suits homeowners, landscapers and small businesses who need a durable, breathable shade solution for patios, carports, pergolas, pool areas and yards. It is particularly good where airflow and drainage matter, since the water permeable fabric prevents puddling and reduces wind stress.

Those who need a fully waterproof canopy or who require a different shape for architectural reasons should look elsewhere; this style is explicitly not waterproof and is designed to be a ventilated shade screen rather than a rain shelter.

Pros & Cons

Pros

• High quality woven HDPE fabric offers strong UV protection and long-term durability.
• Breathable, water permeable design prevents pooling and helps cool covered areas by 10 to 15 degrees.
• Stainless steel D rings and heavy webbing make mounting secure when combined with suitable hardware.
• Custom sizing options allow fitting a range of outdoor layouts.

Cons

• Not waterproof, so it will not keep out heavy rain or provide full weatherproof cover.
• Size accuracy can vary due to manual measurement, so careful measuring is required before ordering.

Specifications

Brand	ShadeMart
Shape	Rectangle
Size	16' x 21'
Material	Woven HDPE (High Density Polyethylene)
UV Rating	UPF50, blocks up to 95% UV
Water Resistance	Water permeable, not waterproof
Hardware	Stainless steel corner D rings with heavy duty webbing

Our Verdict

The ShadeMart 16' x 21' Turquoise rectangle shade sail is a practical, value-driven choice for anyone who wants reliable UV protection and airflow rather than waterproof coverage. It delivers durable fabric, strong anchor points and meaningful cooling for patios, carports and pool areas. Buy it if you need breathable shade and custom sizing options; do not buy it if you require a rainproof shelter.

Frequently Asked Questions

Is this shade sail waterproof?
The sail is water permeable and breathable and is not designed to be waterproof, so it will not keep out heavy rain.

Will it block sun effectively?
Yes, the woven HDPE fabric is UPF50 rated and can block up to 95% of harmful UV, reducing temperatures beneath the sail.

Can it be attached to trees or poles?
Yes, stainless steel D rings and heavy webbing allow secure attachment to poles, trees, walls or roofs when using appropriate hardware kits.