21 ft x 21 ft x 29.7 ft Black Right Triangle Sun Shade Sail - Durable

Our review of this 21 ft x 21 ft x 29.7 ft black right triangle sun shade sail finds it a strong choice for homeowners who need reliable sun protection over a pool, patio, or driveway. Measuring corner to corner and built with slightly curved edges to prevent mid-span sagging, the sail delivers clean tensioned coverage and noticeably cooler shaded areas. Customers praise its durability, color retention and ease of installation, making this shade sail a practical, long-lasting option for outdoor spaces where UV blockage and airflow matter.

Key Features

• Corner-to-corner measurement: Precision sizing helps ensure the installed sail fits the intended span when measured from corner point to corner point.
• Curved edge design: Edges are made slightly curved using a calculated radian to prevent sagging and keep a taut, attractive appearance.
• Virgin polyethylene fabric: Lightweight material with strong tensile strength provides durable weather resistance without adding unnecessary weight during installation.
• High UV and visibility blockage: Fabric blocks up to 95% of UV rays and about 90% of visibility to reduce sun exposure and glare beneath the canopy.
• Allseason utility: Provides shading and cooling in summer, ventilation, some rain resistance, and can reduce frost effects at night.
• Custom orders and warranty: Available for customization and covered by a 3-Year Limited Warranty for added confidence in purchase.

Who It's For

This shade sail is ideal for homeowners with medium to large outdoor areas such as backyards, pool decks, patios, carports or driveways who need an economical way to block sun and reduce heat. It suits DIY installers and those who want a tidy, tensioned canopy that holds shape well among trees or existing anchors.

It may be less suitable for someone who expects full waterproof performance in heavy storms or needs a perfectly rigid, frame-mounted structure; for those uses a hard canopy or specialized awning would be more appropriate.

Pros & Cons

Pros

• Effective sun protection with up to 95% UV blockage, keeping shaded areas noticeably cooler.
• Durable virgin polyethylene construction that customers cite for good longevity and color stability.
• Curved edge pattern prevents midspan sagging, producing a neater, tensioned look after installation.
• Available customization and a 3-Year Limited Warranty add flexibility and reassurance.

Cons

• Hardware included receives mixed feedback, so buyers may need to source stronger anchoring kit for some installations.
• Only slightly rainproof; not intended as a full waterproof shelter in heavy rain.

Specifications

Shape	Right triangle
Measured	Corner to corner
Size	21 ft x 21 ft x 29.7 ft
Color	Black
Material	Virgin polyethylene
UV blockage	Up to 95%
Warranty	3-Year Limited Warranty

Our Verdict

The 21 ft x 21 ft x 29.7 ft black right triangle shade sail is a practical, cost-effective choice for homeowners who want strong UV protection, good airflow and a taut installation without a permanent frame. It offers solid durability and customization options, and is particularly good over pools, patios and driveways where cooling and sun control are priorities.

Frequently Asked Questions

How is this sail measured?
Measurement is taken from corner to corner, and the edges are cut slightly curved to maintain tension and prevent sagging.

Is it waterproof?
The fabric is slightly rainproof but not fully waterproof; it is best for shade, cooling and light rain protection rather than heavy storm shelter.

Does it include mounting hardware?
Some hardware is included, though customer reports are mixed and stronger anchors may be needed depending on the installation site.