ShadeMart 13ft x 18ft Green Sun Shade Sail UPF50 Rectangle

Our review of the ShadeMart 13' x 18' Green Sun Shade Sail finds it best suited for homeowners or small commercial spaces that need reliable sun protection without adding a solid roof. The bottom line: this woven HDPE rectangle sail blocks up to 95% of UV rays and noticeably cools areas beneath it while remaining breathable and water permeable. It is a straightforward, heavy duty fabric canopy that balances durability and airflow, making it a practical choice for patios, carports, pergolas, and poolside coverage when paired with appropriate mounting hardware.

Key Features

• MATERIAL: Woven HDPE fabric delivers a strong, tear-resistant surface that stands up to regular outdoor use while keeping weight low.
• UV PROTECTION: Blocks up to 95% of harmful UV rays and sunlight, which helps lower temperatures in shaded areas by around 10 to 15 degrees.
• BREATHABILITY: The water permeable design allows rain and air to pass through, preventing water pooling and promoting airflow under the sail.
• HARDWARE: Stainless steel corner D rings attached to heavy duty white webbing provide dependable anchor points for proper installation.
• CUSTOM SIZE OPTIONS: A wide selection of custom sizes is available so users can order dimensions that fit irregular or planned outdoor spaces.
• STYLING: Rectangle shape and multiple color choices let the sail function as both functional shade and an outdoor design element.

Who It's For

This ShadeMart rectangle sail is ideal for homeowners, renters with permission to install anchors, and small businesses that want cost-effective, breathable sun protection over patios, carports, pool areas, or outdoor seating. It works well where airflow and reduced heat are priorities and where a nonwaterproof canopy is acceptable because the fabric sheds water rather than acting as a roof.

Those who need a fully waterproof structure, a perfectly rigid rectangular geometry without any variation, or a plug-and-play shade system with included permanent posts should look elsewhere. Professional installers and DIYers comfortable measuring and fitting custom-sized sails will get the most from this product.

Pros & Cons

Pros

• High UPF protection and real temperature reduction make it effective for sun control.
• Durable woven HDPE fabric and stainless steel D rings provide long-lasting anchors and tear resistance.
• Water permeable design prevents water pooling and improves airflow under the canopy.
• Custom sizing options and multiple colors help match specific spaces and aesthetics.

Cons

• Not a waterproof canopy, so it will not keep an area dry during heavy rain.
• Some customers report size or shape variations from manual measurements, so careful measuring is required.

Specifications

Product type	Rectangle shade sail canopy
Size	13 ft x 18 ft
Material	Woven HDPE (High Density Polyethylene)
UV block	Up to 95% UV protection (UPF50 class)
Water rating	Water permeable, not waterproof
Hardware	Stainless steel corner D rings with heavy duty white webbing
Shape	Rectangle

Our Verdict

The ShadeMart 13' x 18' rectangle sun shade sail is a practical, value-oriented choice for anyone wanting strong UV protection, better airflow, and a durable fabric canopy for patios, carports, or pools. It is especially good for buyers who prefer a breathable, water permeable solution and who will use proper hardware to secure a custom-sized installation; it delivers solid sun control without the cost of rigid structures.

Frequently Asked Questions

Is this sail waterproof?
No. The fabric is water permeable and designed to allow water to pass through rather than provide waterproof coverage.

Will it reduce temperature under the canopy?
Yes. The woven HDPE and UPF50 protection block sunlight and typically lower temperatures under the sail by about 10 to 15 degrees.

Can it be attached to posts, walls, or trees?
Yes. With the proper hardware kits the stainless steel D rings and webbing make it attachable to poles, trees, walls, roofs, and other structures.