11 ft x 21 ft x 23.7 ft Red Right Triangle Sun Shade Sail - Durable UV

In this review of the 11' x 21' x 23.7' red right triangle sun shade sail, the bottom line is simple: it is a practical, heavy-duty fabric option for anyone wanting reliable sun protection over medium to large outdoor areas. Our review found the product excels at blocking sunlight while remaining lightweight and ventilated, making it a good choice for patios, poolsides, carports, and gardens where cooling and UV protection matter most.

Key Features

• Corner-to-corner sizing: Measurements are taken from corner to corner so coverage matches the listed dimensions for planning placement.
• Pre-curved edges: Edges are slightly curved using a calculated radian to prevent sagging and keep a taut, attractive appearance.
• Durable fabric: Made from virgin polyethylene, the sail offers strong tensile strength while remaining lightweight for easier handling.
• High UV blockage: Provides up to 95% UV blockage to reduce sun exposure and help keep shaded areas cooler.
• Ventilated design: The breathable weave allows airflow for cooling in summer while also offering some visibility reduction and light rain resistance.
• Customizable and warranted: Available for custom orders and backed by a 3-year limited warranty for added peace of mind.

Who It's For

This shade sail is best for homeowners and renters who need a durable and effective sun-control solution for a medium to large outdoor footprint, such as a backyard seating area, poolside space, driveway, or carport. It suits anyone who prefers a permanent-looking fabric canopy that stays taut and resists sagging.

People who need full waterproofing or a fabric meant for year-round heavy rain or snow should look elsewhere; the sail is only slightly rainproof and is intended mainly for sun protection, cooling, and light weather resistance rather than full shelter.

Pros & Cons

Pros

• High UV blockage and good cooling performance keep shaded areas noticeably cooler.
• Pre-curved edges and strong polyethylene material reduce mid-panel sag and improve long-term appearance.
• Lightweight construction makes it relatively easy to handle during installation.
• Custom order option and a 3-year limited warranty provide flexibility and assurance.

Cons

• Only slightly rainproof, so it is not a substitute for a fully waterproof awning in heavy weather.
• Hardware quality received mixed feedback from customers, so purchasers may want to inspect or upgrade fittings if needed.

Specifications

Shape	Right triangle
Dimensions (corner to corner)	11' x 21' x 23.7'
Material	Virgin polyethylene
UV blockage	Up to 95%
Visibility reduction	Approximately 90%
Warranty	3-Year Limited Warranty

Our Verdict

The 11' x 21' x 23.7' red right triangle sun shade sail is a solid value for anyone who needs effective sun protection and cooling for patios, pools, or carports. With pre-curved edges, strong polyethylene fabric, and up to 95% UV blockage, it delivers reliable performance; buyers who require full waterproofing or top-tier hardware may need to consider additional accessories.

Frequently Asked Questions

Does this sail block UV?
Yes, the fabric provides up to 95% UV blockage to reduce sun exposure.

Will it keep rain out?
The sail is only slightly rainproof and is intended primarily for sun protection rather than full weatherproofing.

Is the size measurement taken along edges?
Measurements are taken from corner to corner and the edges are pre-curved to prevent sagging.