ShadeMart 12 ft x 18 ft Blue Sun Shade Sail - UPF50 Rectangle Canopy

In this review the ShadeMart 12 ft x 18 ft blue rectangle shade sail is evaluated for homeowners and small business owners who need a durable, breathable sun screen for patios, carports or poolside areas. The biggest reason to consider it is its combination of woven HDPE fabric and UPF50 sun protection, which blocks up to 95% of harmful UV rays while remaining water and air permeable. The sail is best for people who want meaningful temperature reduction without a sealed waterproof cover and who appreciate heavy duty stainless steel corner D rings for secure attachment.

Key Features

• MATERIAL: The woven HDPE fabric offers a sturdy, tear-resistant surface that resists fading and performs well in outdoor use.
• UV PROTECTION: Blocks up to 95% of harmful UV rays and sunlight, providing significant cooling and sun safety for patios or pools.
• BREATHABILITY: Water and air permeable design lets rain and breeze pass through so the sail reduces heat without pooling water on the surface.
• HARDWARE: Stainless steel corner D rings attached to heavy duty white webbing give secure anchor points for proper installation.
• CUSTOM SIZE OPTION: A wide selection of custom sizes is available to fit irregular spaces, provided you measure the area accurately before ordering.
• STYLING: Rectangle shape in multiple colors can be integrated into existing outdoor decor as both shade and a decorative element.

Who It's For

The sail suits homeowners with patios, pergolas, carports or pool areas who want UV protection and reduced temperatures without a fully waterproof cover. It is also a good match for installers who will anchor sails to posts, trees, walls or roofs using proper hardware kits.

Those who need a sealed, waterproof canopy or exact precision-cut rectangles should look elsewhere, because this fabric is explicitly water permeable and manual measurements can create slight shape variations even though the fabric area remains constant.

Pros & Cons

Pros

• High UPF sun protection that noticeably lowers temperature in shaded areas.
• Durable woven HDPE fabric and stainless steel D rings for long-term outdoor use.
• Breathable design prevents water pooling and allows airflow during storms.
• Custom sizing options let you match unusual or large spaces.

Cons

• Not waterproof, so it will not keep an area dry in heavy rain.
• Some buyers report variations in exact rectangle shape or perception of size, so careful measurement is required.

Specifications

Brand	ShadeMart
Shape	Rectangle
Size	12 ft x 18 ft
Material	Woven HDPE (High Density Polyethylene)
UV Rating	UPF50, blocks up to 95% of UV rays
Hardware	Stainless steel corner D rings on heavy duty webbing
Water Resistance	Water permeable, not waterproof

Our Verdict

The ShadeMart 12 ft x 18 ft rectangle sail is a practical, cost-effective choice for shading patios, carports and pool areas where sun protection and airflow matter more than waterproofing. Its durable woven HDPE and stainless steel corners make it a reliable long-term solution for most outdoor needs, and custom sizing improves fit for irregular areas, delivering good value for buyers focused on heat reduction and UV safety.

Frequently Asked Questions

Is this shade sail waterproof?
The fabric is water permeable and breathable, so it will not keep an area dry under heavy rain.

How much UV protection does it provide?
The sail offers UPF50 protection and can block up to 95% of harmful UV rays and sunlight.

Can it be attached to trees or posts?
Yes, with the proper hardware kits the stainless steel D rings and webbing allow attachment to poles, trees, walls or roofs.