Custom Size 18ft x 21ft x 27.7ft Right Triangle Sun Shade Sail - UPF50

Our review of the custom size right triangle shade sail finds it best for homeowners and light commercial spaces that need large, tailored sun protection without a permanent structure. The single biggest reason to buy is straightforward: this sail uses 200 GSM HDPE fabric and stainless steel hardware to deliver reliable 95% sun protection and a significant temperature drop under the canopy. It installs to trees, posts, walls or roofs and can be ordered to exact D-ring-to-D-ring measurements for a neat, fitted look.

Key Features

• 95% UV blockage: The 200 GSM HDPE material blocks up to 95% of UV rays to protect people and furnishings beneath the sail.
• Temperature reduction: The knitted fabric lowers ambient temperature by up to about 15 degrees compared with unshaded areas for a cooler outdoor zone.
• Custom sizing: The sail is made to order with measurements taken from D-ring to D-ring so the fit can be tailored to unusual spaces.
• Durable construction: Reinforced edges, double-layer stitching and stainless steel D-rings reduce tearing and hardware corrosion for longer service life.
• Flexible mounting: The sail can attach to trees, roofs, walls or poles using common mounting hardware and allows small corner gaps for tensioning.
• Commercial standard: Built to a higher-duty specification intended for frequent outdoor use in residential and light commercial settings.

Who It's For

This shade sail suits homeowners, cafes, daycare playgrounds or patio installers who need a large, tailored right-triangle canopy with strong UV protection and a cooler shaded area. It is especially useful where a custom fit matters because of irregular attachment points or when a permanent structure is not desired.

Shoppers seeking a temporary umbrella replacement, a breathable shade that sheds some rain while allowing airflow, or a product with stainless hardware and reinforced stitching will find this sail appealing. Those who need a fully waterproof tarp, a rigid frame canopy, or who expect decades of maintenance-free performance in extreme sun may want to consider alternative rated products or plan for periodic replacement.

Pros & Cons

Pros

• High UV protection that makes outdoor spaces noticeably cooler and safer from sun exposure.
• Custom sizing option delivers a clean, tailored installation for irregular areas.
• Robust details such as stainless steel D-rings and double stitching improve longevity and reliability.
• Breathable design reduces heat buildup while allowing air and some water through, unlike solid tarps.

Cons

• Durability reports are mixed over long-term heavy sun exposure, so expect potential replacement after extended outdoor use in harsh climates.
• Not fully waterproof, so it will not provide complete shelter in heavy rain.

Specifications

Product shape	Right triangle
Size	18' x 21' x 27.7' (custom made)
Material	200 GSM HDPE knitted fabric
UV protection	Up to 95% blockage (UPF50+)
Hardware	Stainless steel D-rings, reinforced edges
Water handling	Water and air permeable (not fully waterproof)
Warranty/assurance	3 years assurance included

Our Verdict

The custom right triangle shade sail is a practical, value-oriented choice for anyone needing large-area sun protection with a tailored fit. Its 95% UV protection, sturdy hardware and temperature reduction make it a sensible buy for patios, play areas and light commercial use, provided buyers accept that heavy, continuous sun exposure may require replacement over time.

Frequently Asked Questions

Can this sail be attached to trees and walls?
Yes. The sail is designed for flexible installation to trees, roofs, walls or poles using mounting hardware; leave small corner gaps for tensioning.

Is the fabric waterproof?
No. The 200 GSM HDPE fabric is water and air permeable, so it sheds some rain but does not act as a fully waterproof tarp.

How are custom sizes measured?
Custom sizing is based on measurements taken from D-ring to D-ring so the finished sail matches attachment points for a neat, tensioned fit.