ShadeMart 17 ft x 21 ft Grey Sun Shade Sail - UPF50 Cooling Canopy

In this review of the ShadeMart 17' x 21' grey sun shade sail, the bottom line is simple: it is a heavy-duty, breathable canopy for people who need dependable UV protection and airflow over large outdoor areas. The reviewer found it best for patios, carports and poolside canopies because the woven HDPE fabric blocks up to 95% of harmful UV rays while letting water and air pass through, and the stainless steel D rings with reinforced webbing make mounting secure. If you want a nonwaterproof, ventilated shade that lowers temperatures, this sail delivers.

Key Features

• Woven HDPE fabric: provides durable, breathable sun protection that reduces heat under the canopy.
• UPF50 protection: blocks up to 95% of harmful UV rays, helping protect skin and furniture from sun damage.
• Stainless steel D rings: heavy duty corner rings attached to white webbing give secure anchor points for a long-lasting installation.
• Water and air permeable: allows rain and breeze to pass through so the sail does not balloon or trap moisture during storms.
• Custom sizing available: the brand offers many sizes so you can get a sail that matches specific patio, pergola or carport dimensions.

Who It's For

This shade sail is aimed at homeowners and renters who need a large, ventilated sun canopy for patios, yards, carports or over pools and want to lower surface temperatures without creating a sealed roof. It suits DIY installers who will attach the sail to poles, walls, trees or roof points using compatible hardware kits.

It is not for buyers who need a fully waterproof canopy or a rigid, permanent roof replacement; those users should consider solid awnings or waterproof covers instead. Also measure carefully before ordering a custom size because manual measurements can vary.

Pros & Cons

Pros

• Durable woven HDPE construction that customers report holds up well and provides consistent shade.
• Effective UV blocking and noticeable cooling under the sail, improving outdoor comfort.
• Stainless steel D rings and reinforced webbing make attachment points strong and reliable.
• Breathable design prevents water pooling and lets wind pass through, reducing stress in high winds.

Cons

• Not waterproof, so it will not keep an area dry in a rainstorm.
• Some customers report mixed experiences with exact sizing, so careful measurement is required before purchase.

Specifications

Our Verdict

The ShadeMart 17' x 21' grey sun shade sail is a practical, value-minded choice for anyone wanting strong UV protection and airflow over a large outdoor area. Its heavyweight woven HDPE and reinforced corners make it durable and easy to secure, and while it is not waterproof it reliably lowers temperatures and stands up to challenging conditions, making it a good investment for patios, carports and poolside shade.

Frequently Asked Questions

Is this shade sail waterproof?
No, the fabric is water permeable and breathable; it will not provide a dry cover in rain.

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

Will it block UV effectively?
Yes, the woven HDPE fabric offers UPF50 protection and blocks up to 95% of harmful UV rays.