ShadeMart 20ft x 21ft Grey Sun Shade Sail UPF50 Rectangle - Cool

In this review the ShadeMart 20' x 21' Grey Sun Shade Sail is evaluated for homeowners and small businesses seeking a large, breathable sun cover. The bottom line: this rectangle HDPE sail is best for people who need reliable UV protection and airflow without full waterproofing. It blocks most sunlight while lowering temperatures on patios and carports, and customers repeatedly praise its durability and ease of installation, making it a practical choice for shaded outdoor living rather than a rainproof canopy.

Key Features

• Woven HDPE fabric: The high density polyethylene cloth provides strong sun protection and resists tearing while remaining lightweight for easier handling and installation.
• UPF50 sun protection: The sail blocks up to 95% of harmful UV rays and sunlight, which noticeably reduces surface and ambient temperatures under the canopy.
• Water and air permeable: The breathable design allows rain and wind to pass through, preventing water pooling and reducing sail stress in breezy conditions.
• Stainless steel corner D rings: Heavy duty D rings attached to white webbing give secure anchor points that hold up under tension and repeated use.
• Custom sizing available: A wide selection of custom sizes lets buyers match the sail area to patios, pergolas, or carports, provided accurate measurements are supplied.
• Decorative rectangle styling: The simple rectangle shape and neutral grey color integrate easily with existing outdoor decor while delivering broad shade coverage.

Who It's For

The ShadeMart rectangle sail is ideal for homeowners, renters, and small business owners who want a cost-effective way to reduce sun exposure on patios, decks, pool areas, and carports. It suits anyone who values breathability and UV protection over waterproof coverage and who can install the sail on posts, walls, or trees with proper hardware.

It is less suitable for those who need a fully waterproof shelter or a permanent hard-structure canopy; if rain protection is a top requirement, buyers should look for a waterproof awning or solid roofing solution instead.

Pros & Cons

Pros

• High UV blocking performance keeps shaded areas significantly cooler and protects people and furniture from sun damage.
• Durable construction with stainless steel D rings and heavy webbing provides secure attachment points for repeated seasonal use.
• Breathable, water-permeable fabric prevents pooling and performs well in windy conditions.
• Custom size options and simple rectangle styling make it versatile for many outdoor spaces.

Cons

• Not waterproof, so it will not provide reliable rain protection for extended downpours.
• Size accuracy depends on careful measurement and manual production, so some buyers report sizing discrepancies.

Specifications

Product type	Rectangle shade sail
Size	20' x 21'
Material	Woven HDPE (High Density Polyethylene)
UV protection	UPF50, blocks up to 95% of UV
Drainage	Water permeable / breathable
Corner fittings	Stainless steel D rings with heavy duty white webbing
Color / shape	Grey rectangle

Our Verdict

The ShadeMart 20' x 21' grey sail is a practical, value-oriented option for anyone wanting effective UV protection and improved outdoor comfort without adding a waterproof roof. Its durable fittings, breathable fabric, and customization options make it a smart choice for patios, carports, and poolside shade, provided buyers accept that it will not stop heavy rain.

Frequently Asked Questions

Is this sail waterproof?
The fabric is water permeable and breathable, so it is not waterproof and will allow water to pass through.

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

Will it reduce temperature under the sail?
Yes, the UPF50 fabric blocks most sunlight and typically lowers temperatures in shaded areas by a noticeable amount.