13ft x 21ft x 24.7ft Black Right Triangle Sun Shade Sail - Durable UV

Our review of the 13' x 21' x 24.7' Black Right Triangle Sun Shade Sail finds it best suited for homeowners who need a large, simple solution to cool patios, pool areas, or carports. The single biggest reason to buy is its balance of heavy-duty virgin polyethylene fabric and a shape engineered to resist sagging; measurement is taken corner to corner and the edges are slightly curved to maintain tension and appearance. For anyone who wants strong UV protection and straightforward coverage without complex installation, this shade sail delivers solid performance.

Key Features

• Corner-to-corner sizing: Measurements are taken from corner to corner so buyers can match the triangular footprint to an existing space with predictable coverage.
• Curved edge design: Edges are slightly curved using a calculated radian to prevent sagging in the middle and keep the canopy taut over time.
• High-strength fabric: Made of virgin polyethylene, the sail combines strong tensile strength with light weight for easier handling and durable outdoor use.
• UV and visibility blockage: Provides up to 95% UV blockage and 90% visibility blockage to reduce sun exposure and glare while allowing airflow.
• All-season utility: Offers shading and ventilation in summer, some frost protection at night, and light rain resistance during brief showers.
• Custom options and warranty: Comes with a 3-year limited warranty and can be customized to fit nonstandard mounting layouts.

Who It's For

This shade sail is a good match for homeowners with patios, pools, driveways, carports, gardens or balconies who want a broad, effective sun shield that stays tight and looks neat. It fits people who favor a minimal aesthetic and need a fabric solution that balances UV protection with airflow.

It is less appropriate for those who need full waterproofing in prolonged heavy rain or for buyers who prefer a motorized or rigid awning system; if you need complete rain protection or automated adjustment, consider a hard-top or retractable alternative instead.

Pros & Cons

Pros

• Durable virgin polyethylene fabric gives strong tensile strength without heavy bulk.
• Engineered curved edges help maintain a taut shape and reduce mid-span sagging.
• High UV blockage reduces sun exposure and helps keep pool and patio areas cooler.
• Customization available and backed by a 3-year limited warranty for peace of mind.

Cons

• Only slightly rainproof, so it is not a substitute for a fully waterproof awning in heavy storms.
• Hardware quality gets mixed feedback from customers, so double-check fittings during installation.

Specifications

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

Our Verdict

For backyard patios, pools, and carports that need reliable sun protection without complex installation, this right triangle shade sail is a practical, cost-effective choice. The curved-edge design and strong virgin polyethylene material keep the canopy looking neat and performing well, and the 3-year warranty plus customization options make it good value for homeowners who prioritize UV protection and airflow over full rainproofing.

Frequently Asked Questions

How is the sail sized?
The measurement is taken corner to corner and the edges are slightly curved to ensure the sail stays taut when properly installed.

Will it block most sun and heat?
Yes, the fabric is rated to block up to 95% of UV and up to 90% of visibility, which helps keep shaded areas noticeably cooler.

Is it waterproof?
The sail is slightly rainproof for light showers but is not a full waterproof solution for heavy or prolonged rainstorms.