13 ft x 21 ft x 24.7 ft Red Right Triangle Shade Sail - UV Block

In this review of the 13' x 21' x 24.7' red right triangle shade sail, the bottom line is simple: this is a practical, heavy-duty canopy for anyone who needs wide, angled sun protection over a pool, patio, carport or garden. The reviewer found the sail's corner-to-corner measurement and slightly curved edges deliver a taut, attractive fit that resists midspan sagging, and its virgin polyethylene fabric provides substantial UV and visibility blockage for summer cooling. This review focuses on real-use performance, installation notes, and who gets the most value from this sail.

Key Features

• Corner-to-corner measurement: The stated dimensions are measured from corner to corner so buyers can plan mounting points precisely for an accurate fit.
• Curved edges: Edges are cut with a calculated radian to reduce sagging and maintain a smooth, taut appearance when tensioned.
• Virgin polyethylene fabric: The material is lightweight with strong tensile strength, making the sail durable and resistant to tearing under tension.
• High UV blockage: Blocks up to 95% of UV and around 90% of visibility to significantly reduce sun exposure and help keep shaded areas cooler.
• All-season utility: Provides summer shading and ventilation, some rain resistance, and can reduce overnight frost exposure in cooler conditions.
• Custom and warranty options: Available for custom sizing and backed by a 3-year limited warranty, which helps protect the purchase over time.

Who It's For

This shade sail is best for homeowners and renters with medium to large outdoor spots who want a durable, attractive way to block sun over a pool, patio, driveway or garden. It suits DIY installers who can anchor three points at the correct distances and prefer a lightweight but strong fabric that resists sagging.

Those who should look elsewhere include buyers needing a fully waterproof awning, exact factory-fitted hardware perfection, or a product in a custom shape without consulting the seller, since some users reported mixed experiences with included hardware and the sail is only slightly rainproof rather than watertight.

Pros & Cons

Pros

• Durable virgin polyethylene fabric that provides strong tensile strength and long seasonal use.
• High UV and visibility blockage that helps keep shaded spaces noticeably cooler.
• Curved edges and corner-to-corner sizing reduce midspan sag and produce a neat, tensioned look.
• Custom order option and a 3-year limited warranty add flexibility and reassurance.

Cons

• Hardware quality received mixed feedback from customers, so buyers may want to inspect or upgrade mounting fittings.
• Only slightly rainproof; not a replacement for a fully waterproof canopy in heavy rain.

Specifications

Shape	Right triangle
Measured	Corner to corner
Size	13' x 21' x 24.7'
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' red right triangle shade sail is a solid value for anyone who needs substantial sun protection with a neat, tensioned fit. Its durable virgin polyethylene and curved-edge design deliver good long-term performance for patios, pools and carports, though buyers who need complete waterproofing or premium supplied hardware should plan for possible accessories or upgrades.

Frequently Asked Questions

How is the sail measured?
Measurement is taken from corner to corner, which helps you plan mount point distances accurately.

Does it block UV effectively?
Yes, the fabric provides up to 95% UV blockage and about 90% visibility reduction to lower sun exposure and heat.

Is it fully waterproof?
No, it is slightly rainproof but not fully waterproof; heavy rain may pass through or run off the edges.