ShadeMart 17ft x 21ft White Sun Shade Sail UPF50 Rectangle - Durable

In this review the ShadeMart 17' x 21' White Sun Shade Sail is judged on practicality and build quality for homeowners and small business owners who need affordable UV protection. The bottom line: this rectangle shade sail is a straightforward, heavy-duty choice for cooling patios, carports, and pool areas because it uses woven HDPE fabric that blocks up to 95% of UV rays while remaining water and air permeable. Our review focuses on real-world use, durability, and whether it delivers cooler, shaded space without claiming to be waterproof.

Key Features

• Woven HDPE fabric: The material blocks up to 95% of harmful UV rays while remaining breathable so heat is reduced and airflow continues.
• Stainless steel corner D rings: Heavy-duty stainless D rings attached to white webbing give reliable anchor points that resist corrosion outdoors.
• Water and air permeable: The sail allows water to pass through so rain will not pool on the fabric and wind load is reduced by airflow.
• Custom size options: A wide selection of sizes is available so users can order closer to their venue dimensions for a neater fit.
• Decorative rectangle shape: The simple geometric styling integrates easily with patios, pergolas, and yards without overwhelming existing design.

Who It's For

The ShadeMart 17' x 21' White Sun Shade Sail suits homeowners who want a large, economical canopy for patios, porches, carports, or poolside areas and value UV protection and airflow over full waterproofing. It also fits renters and DIYers who can attach the sail to trees, poles, or walls using proper hardware kits.

Those who should look elsewhere include buyers needing a fully waterproof cover or precise, guaranteed fit without measuring; this style is explicitly not waterproof and manual measurement variance can affect fit, so a custom-fabricated waterproof awning would be a better choice for covered outdoor kitchens or enclosed seating.

Pros & Cons

Pros

• High UV protection and measurable cooling from the breathable HDPE fabric.
• Durable hardware with stainless steel D rings and heavy webbing for secure anchoring.
• Easy to install for most DIYers and versatile mounting options to poles, trees, or walls.
• Good value for size and durability compared with other nonwoven covers.

Cons

• Not waterproof, so it does not keep an area dry during rain.
• Size may vary due to manual measurements, so careful measuring is required before ordering.

Specifications

Product type	Rectangle shade sail
Size	17 ft x 21 ft
Material	Woven HDPE (High Density Polyethylene)
UV protection	Up to 95% block of harmful UV rays
Corners	Stainless steel D rings attached to heavy duty white webbing
Water resistance	Water permeable, not waterproof
Uses	Patio, carport, pergola, pool, yard, window shade

Our Verdict

The ShadeMart 17' x 21' White Sun Shade Sail is a practical, value-driven canopy for anyone prioritizing UV protection, airflow, and durability over waterproofing. It delivers strong shade, corrosion-resistant hardware, and flexible mounting options, making it a sensible pick for patios, carports, and pool areas where cooling and sun blockage are the main goals.

Frequently Asked Questions

Is this shade sail waterproof?
The sail is water permeable and breathable by design and is not waterproof, so it will not keep an area dry in rain.

How much UV protection does it provide?
The woven HDPE fabric blocks up to 95% of harmful UV rays, which helps lower temperatures under the sail.

Can I install it on trees or poles?
Yes, with the proper hardware kits the sail can be attached to poles, trees, walls, roofs, and similar structures.