13 ft x 21 ft Green Right Triangle Sun Shade Sail - Durable UV Block

In this review of the 13' x 21' x 24.7' Green Right Triangle Sun Shade Sail, the bottom line is straightforward: this is a practical, heavy-duty shade sail for homeowners who need broad UV protection over patios, pools or driveways. The reviewer found the sail's virgin polyethylene fabric and engineered curved edges deliver a taut, neat appearance and effective sun blockage, making it ideal for cooling outdoor spaces while remaining lightweight and ventilated. The inclusion of a 3-year limited warranty and the option for custom sizes also make this a solid long-term choice.

Key Features

• Corner-to-corner measurement: Sizing is taken from corner to corner so buyers get predictable coverage for triangular installations.
• Curved edge design: Precisely calculated radian curves on the edges reduce mid-span sagging for a cleaner, taut look and better water run-off.
• Virgin polyethylene fabric: The material is lightweight but strong, offering high tensile strength for longer life in outdoor conditions.
• UV and visibility blockage: Blocks up to 95% of UV and about 90% of visible light to keep shaded areas cooler and protect surfaces from sun exposure.
• Seasonal versatility: Provides shading and ventilation in summer, some frost protection at night, and light rain resistance during mild showers.
• Custom orders available: The product can be tailored to fit nonstandard spaces, useful for irregular patios and unique installations.

Who It's For

This shade sail is best for homeowners with medium to large outdoor spaces such as backyards, pools, patios, balconies or carports who need reliable UV protection and prefer a tidy, tensioned installation. It suits DIY installers and landscapers who value a balance of strength and breathability in a shade fabric.

Those seeking a fully waterproof awning or a rigid pergola substitute should look elsewhere, since this product is described as only slightly rainproof and relies on proper tensioning for performance. Also, buyers who prefer packaged hardware that always meets every installation scenario may want to confirm compatibility with their mounting points.

Pros & Cons

Pros

• High UV blockage keeps shaded areas noticeably cooler and protects furniture and skin.
• Curved edges and corner-to-corner sizing minimize sagging for a neat, professional appearance.
• Lightweight virgin polyethylene is strong, durable, and allows ventilation to reduce heat buildup.
• Custom sizing and a 3-year limited warranty provide reassurance for long-term installations.

Cons

• Only slightly rainproof, so it will not replace a fully waterproof canopy in heavy or prolonged rain.
• Some customers reported mixed experiences with the included hardware, so fittings may need supplementing for certain sites.

Specifications

Shape	Right triangle
Size (corner-to-corner)	13' x 21' x 24.7'
Color	Green
Material	Virgin polyethylene
UV blockage	Up to 95%
Visibility blockage	About 90%
Warranty	3-Year Limited Warranty

Our Verdict

The 13' x 21' x 24.7' Green Right Triangle Sun Shade Sail offers strong value for outdoor shading needs where sun protection, airflow and a tidy finish matter most. It is a practical choice for patios, pools and driveways, especially when buyers take advantage of custom sizing and double-check hardware needs for their mounting points.

Frequently Asked Questions

How much sun does this sail block?
It provides up to 95% UV blockage and approximately 90% visibility blockage, significantly reducing direct sun exposure.

Is it waterproof?
The fabric is slightly rainproof for light showers but is not fully waterproof and will not replace a sealed canopy in heavy rain.

Can I order a custom size?
Yes, the manufacturer offers custom orders so you can get nonstandard shapes or dimensions for specific installation needs.