ShadeMart 12 ft x 17 ft White Sun Shade Sail UPF50 Rectangle

In this review the ShadeMart 12 ft x 17 ft rectangle sun shade sail is evaluated for homeowners and outdoor enthusiasts who want reliable UV protection without sealing off airflow. The bottom line: this breathable HDPE canopy delivers strong sun blocking and long-term durability for patios, carports and poolside areas, with the biggest reason to buy being its combination of high UPF protection and water permeability that lowers temperatures noticeably while allowing rain and breeze to pass through. Installation is straightforward with proper hardware and it fits a variety of mounting points.

Key Features

• Woven HDPE fabric: Provides durable, knitted strength that resists tearing while maintaining a lightweight feel for easy handling and storage.
• UPF50 sun protection: Blocks up to 95% of harmful UV rays to significantly reduce sun exposure and lower surface temperatures beneath the sail.
• Water permeable design: Allows water and air to pass through so the sail does not pool water and improves ventilation on hot days.
• Stainless steel D rings: Heavy duty corner fittings attached to white webbing for secure anchoring and corrosion resistance in outdoor environments.
• Custom size options: A range of custom dimensions is available so buyers can match the sail area to patios, carports, pergolas, or yards when measured accurately.
• Decorative rectangle shape: Clean geometric styling that integrates with existing outdoor decor while providing a large shaded footprint.

Who It's For

The ShadeMart rectangle sun sail is ideal for homeowners looking to shade mid to large outdoor areas such as patios, carports, pergolas or poolside seating where airflow and rain drainage are desired along with strong sun protection. It also suits renters or seasonal users who need a removable, reusable canopy that installs to trees, poles, or building anchors.

Those who need a fully waterproof awning or a rigid permanent structure should look elsewhere, since this HDPE style is explicitly water permeable rather than waterproof. Buyers should also measure mounting points carefully and consider professional installation for complex layouts or permanent fittings.

Pros & Cons

Pros

• Effective UV protection blocking up to 95% of sunlight while lowering temperatures beneath the sail.
• Durable construction with woven HDPE and stainless steel D rings that hold up in harsh weather.
• Breathable, water permeable design prevents pooling and improves comfort on hot days.
• Available in custom sizes to fit a wide variety of outdoor spaces.

Cons

• Not waterproof, so it will not provide full rain shelter during heavy downpours.
• Some customers note size and shape can vary slightly due to manual measurements, so accurate measuring is essential.

Specifications

Brand	ShadeMart
Shape	Rectangle
Size	12 ft x 17 ft
Material	Woven HDPE (High Density Polyethylene)
UV Protection	UPF50, blocks up to 95% UV
Water Resistance	Water permeable / not waterproof
Fittings	Stainless steel D rings on heavy duty webbing

Our Verdict

The ShadeMart 12 ft x 17 ft white rectangle shade sail is a strong value for anyone who needs reliable sun protection with good airflow and easy seasonal installation. It is particularly well suited to patios and carports where lowering temperature and blocking UV are priorities; buyers who require full rain protection should consider a different product. Overall, the combination of durable materials, UPF50 protection and custom sizing makes it a practical, long-lasting choice.

Frequently Asked Questions

Is this shade sail waterproof?
No. The fabric is water permeable and breathable, so it allows water to pass through rather than acting as a waterproof cover.

Will it reduce temperature under the sail?
Yes. The UPF50 fabric blocks most UV and typically lowers temperatures beneath the sail, improving comfort on sunny days.

Can it be attached to trees or poles?
Yes. With the proper hardware kits it can be mounted to poles, trees, walls or roofs; secure anchoring and accurate measurements are recommended.