ShadeMart 18ft x 20ft Red Sun Shade Sail UPF50 Rectangle - Heavy Duty

Our review of the ShadeMart 18' x 20' Red Sun Shade Sail finds it best for homeowners and small businesses who want durable, breathable sun protection over patios, carports or pool areas; the single biggest reason to buy is the fabric's combination of heavy duty woven HDPE and stainless steel corner D rings that deliver long-lasting, UV-blocking cover without trapping heat. Installers will appreciate that the sail is water permeable and reduces temperatures noticeably while remaining easy to tension and adapt to posts, walls or trees.

Key Features

• Material: Woven HDPE fabric provides a strong, tear-resistant canopy that stays stable under regular outdoor exposure.
• UV protection: Blocks up to 95% of harmful UV rays so shaded areas are significantly cooler and safer for prolonged outdoor use.
• Hardware: Stainless steel corner D rings attached to heavy duty white webbing make anchoring the sail reliable and rust resistant.
• Breathability: The water permeable, air-permeable weave allows wind and rainwater to pass through, reducing wind load and pooling compared with solid tarps.
• Custom sizing: A range of custom sizes is available so the sail can be matched to irregular patios, carports or pergolas when measured accurately.
• Styling: Rectangle shape and bold red color provide both practical shade and a decorative focal point for outdoor spaces.

Who It's For

Best for homeowners, renters with outdoor entertaining space, or small business operators who need a reliable, breathable sun canopy for patios, carports, pergolas and poolside areas. People who want to lower surface and ambient temperatures while still allowing airflow will value this product.

Not the best choice for buyers who require full waterproof protection or an opaque cover for complete light blockage; those users should consider a waterproof awning or hard shade structure instead.

Pros & Cons

Pros

• Durable woven HDPE construction and stainless steel hardware give a robust feel and long-term performance.
• Blocks up to 95% of UV rays and can lower temperatures substantially beneath the sail.
• Breathable, water permeable design prevents water pooling and handles wind better than solid covers.
• Custom sizing options make it adaptable to many outdoor layouts.

Cons

• Not waterproof, so it will not provide full rain protection in heavy storms.
• Size accuracy depends on careful measurement and manual measurement variation can occur.

Specifications

Brand	ShadeMart
Shape	Rectangle
Size	18' x 20'
Material	Woven HDPE (High Density Polyethylene)
Hardware	Stainless steel corner D rings with heavy duty white webbing
Functionality	Water and air permeable, blocks up to 95% UV

Our Verdict

The ShadeMart 18' x 20' rectangle shade sail is a practical, good-value choice for anyone wanting effective UV protection and airflow for patios, carports or pool areas; its heavy duty HDPE fabric and stainless steel D rings deliver durability and ease of installation, while the permeable weave limits pooling and wind issues, although it will not serve as a waterproof cover.

Frequently Asked Questions

Is this sail waterproof?
No, this style is water permeable and breathable, so it will not keep out heavy rain but prevents water pooling by allowing water to pass through.

Can it be attached to trees or posts?
Yes, with proper hardware kits the sail can be anchored to poles, trees, walls, roofs or other structures.

Will it block UV and lower temperatures?
Yes, the fabric blocks up to 95% of UV rays and is reported to reduce temperatures under the sail noticeably.