Sun Shade Sail 18ft x 20ft Rectangle Terra - High UV Block

In this review the SUNN Y GUARD Sun Shade Sail 18ft x 20ft Rectangle Terra is assessed for backyard and patio use; it is aimed at homeowners and renters who need a simple, low-cost way to reduce sun exposure and lower temperatures outdoors. The single biggest reason to buy is its effective UV protection, which blocks up to 95% of harmful rays while still allowing air and water to pass through, making it practical for hot, sunny climates and poolside shading solutions.

Key Features

• Material: Made from high density polyethylene 185GSM, the fabric is durable and resists tearing better than thin plastics.
• UV Block: Blocks up to 95% of harmful UV rays, providing reliable sun protection for patios, pools and play areas.
• Breathable Design: The fabric allows air and water to pass through so it reduces heat buildup and sheds rain without acting like a tarp.
• Customizable Size: The brand offers custom sizing to fit irregular outdoor spaces when the listed rectangle sizes do not match.
• Included Accessories: Ships with 3-4 thickened ropes for installation so a basic setup can be completed quickly out of the box.
• Made in USA: Manufactured domestically, which may simplify custom orders and support inquiries.

Who It's For

This shade sail is best for homeowners with a backyard, patio, deck, pool or BBQ area who want a permanent-looking but flexible shade solution that is easier and cheaper than fixed awnings. It suits people in hot, sunny climates who prioritize UV protection and airflow to keep shaded areas cooler.

Those who need a fully rigid roof, motorized retractable system, or a decorative fabric with heavy waterproofing should look elsewhere; this product is a breathable polyethylene sail designed for shade and cooling rather than total weatherproof roofing.

Pros & Cons

Pros

• Effective sun and UV blocking performance, rated up to 95%.
• Breathable fabric reduces heat buildup and lets water pass through during light rain.
• Sturdy construction with reinforced edges and included thick ropes for quick installation.
• Custom sizing and US manufacturing make it easier to fit odd layouts.

Cons

• Not fully waterproof, so it will not serve as a rainproof roof in heavy storms.
• For long-term durability, customers may want to buy specialized stainless steel hardware separately.

Specifications

Material	High density polyethylene (185GSM)
UV Block Rate	Up to 95%
Included Accessories	Rope x 3 PCS (triangle) / 4 PCS (square or right triangle)
Shape / Size	Rectangle 18ft x 20ft (custom sizes available)
Breathability	Permeable to air and water
Origin	Made in USA

Our Verdict

The SUNN Y GUARD 18ft x 20ft rectangle sun shade sail is a practical value purchase for anyone needing strong UV protection and cooler outdoor spaces without a complex installation. It balances effective sun blocking, airflow and simple setup, and is a better budget option than permanent awnings for many homeowners, though customers should plan extra stainless hardware if they want maximum longevity.

Frequently Asked Questions

Will this sail block most of the sun?
The fabric blocks up to 95% of harmful UV rays and significantly reduces direct sunlight in the shaded area.

Is the sail waterproof?
No, it is breathable and allows water to pass through; it is intended for shade and cooling rather than full rain protection.

Are installation accessories included?
Yes, the package includes 3-4 thickened ropes, but the manufacturer recommends stainless steel sunshade hardware for long-term durability.