21 ft x 23 ft x 31.1 ft Gray Right Triangle Sun Shade Sail - Custom

In this review we look at the 21' x 23' x 31.1' gray right triangle sun shade sail and who will get the most value from it. The bottom line: this shade sail is for homeowners and outdoor space owners who need a large, durable fabric canopy that blocks sun and lowers temperature under it. Our review finds the product delivers strong UV protection and a tailored fit because the measurement is taken from corner to corner and the edges are slightly curved to prevent sagging, making it a practical solution for patios, pools, driveways and carports.

Key Features

• Corner-to-corner measurement: The sail is measured from corner to corner so buyers can plan mounting points precisely for a true triangular fit.
• Curved edges: Edges are made slightly curved using a calculated radian to prevent sagging in the middle, keeping the canopy taut and neat over time.
• Durable virgin polyethylene: Fabric has high tensile strength while remaining lightweight, so it withstands outdoor conditions without heavy bulk.
• High UV and visibility blockage: Provides up to 95% UV blockage and about 90% visibility blockage to reduce sun exposure and glare beneath the sail.
• All-season benefits: Offers shading and cooling in summer, ventilation, anti-frost protection at night and slight rain resistance during brief showers.
• Custom orders and warranty: Available to be customized to fit nonstandard spaces and backed by a 3-Year Limited Warranty for added confidence.

Who It's For

This shade sail is best for homeowners with medium to large outdoor areas such as a backyard patio, over a pool, a carport, or a driveway who want a sizable triangular canopy that stays tight and looks finished. It fits well for people who prefer a fabric solution that reduces heat and sun exposure while allowing airflow.

It may be less ideal for buyers who need full waterproofing during heavy storms, those who require rigid structures, or anyone needing a very small or exact rectangular awning; the sail is specifically a right triangle shape measured corner to corner and provides only slight rain resistance rather than full rainproofing.

Pros & Cons

Pros

• Strong UV protection that keeps shaded areas noticeably cooler and reduces sun exposure.
• Thoughtful construction with curved edges reduces mid-span sag so the canopy maintains a tidy appearance.
• Lightweight but durable virgin polyethylene fabric for long-term outdoor use and easy handling during installation.
• Custom order option and a 3-Year Limited Warranty add flexibility and peace of mind.

Cons

• Not fully waterproof; it is only slightly rainproof during light rain and not intended as a full rain barrier.
• Included hardware receives mixed feedback, so customers may want to verify mounting accessories or upgrade them for very heavy-duty installs.

Specifications

Shape	Right triangle
Size (corner-to-corner)	21' x 23' x 31.1'
Color	Gray
Material	Virgin polyethylene
UV blockage	Up to 95%
Visibility blockage	Approximately 90%
Warranty	3-Year Limited Warranty

Our Verdict

The 21' x 23' x 31.1' gray right triangle shade sail is a strong choice for anyone who needs a large, breathable canopy that reduces sun and heat with a clean, taut look. Its curved-edge design and durable polyethylene fabric make it good value for patios, pools, carports and gardens, especially when a customized fit and a multi-year warranty matter more than full waterproofing.

Frequently Asked Questions

How is the sail measured?
Measurement is taken from corner to corner so you should plan mounting points to match those dimensions for proper fit.

Is the fabric waterproof?
The fabric is slightly rainproof in light showers but not intended as a full waterproof solution for heavy rain.

Can I order a different size or color?
Yes, all products are available to be customized; contact the seller to arrange custom orders.