ShadeMart 16 ft x 20 ft Blue Sun Shade Sail UPF50 Rectangle - Heavy

In this review the ShadeMart 16' x 20' Blue Sun Shade Sail is evaluated for homeowners and RV owners who need large-area UV protection without a permanent structure. The bottom line: this rectangle sail delivers durable, breathable shade that noticeably cools covered areas and resists fading, making it a solid choice for patios, carports and poolside canopies. Reviewers will appreciate the woven HDPE fabric and stainless steel D rings that create a reliable attachment system while still allowing water and air to pass through.

Key Features

• Woven HDPE fabric: the high density polyethylene construction provides a durable, tear-resistant canopy that blocks up to 95% of harmful UV rays.
• Stainless steel D rings: reinforced corner hardware attached to heavy duty white webbing makes for secure anchoring and long-term corrosion resistance.
• Water and air permeable: the breathable design allows rain and wind to pass through, reducing sail stress and preventing water pooling.
• Temperature reduction: the fabric significantly lowers temperatures under the sail, often by about 10 to 15 degrees depending on conditions.
• Custom sizing available: the manufacturer offers a range of sizes so customers can match the sail to patios, pergolas, carports or RV covers with measured accuracy.

Who It's For

The ShadeMart 16' x 20' rectangle sail is best for homeowners, renters and RV owners who want a nonpermanent shade solution that installs between posts, trees or building anchor points. It suits patios, driveways and pool areas where UV protection, airflow and reduced heat are primary concerns.

Those who need a fully waterproof cover, an exact color match guarantee, or precision factory-cut dimensions without any manual variance should consider a different product or a custom-fabricated canopy; this sail is breathable and sizes may vary slightly due to manual measurement but the fabric area remains constant.

Pros & Cons

Pros

• Heavy woven HDPE resists tearing and maintains color well in hot weather according to users.
• Stainless steel D rings and white webbing provide secure and durable anchor points for installation.
• Breathable, water-permeable design prevents pooling and reduces wind stress on the sail.

Cons

• Not waterproof, so it will not keep an area dry during steady rain.
• Some customers report mixed color expectations and slight variance in stated size due to manual measurements.

Specifications

Product shape	Rectangle
Size	16' x 20'
Material	Woven HDPE (High Density Polyethylene)
UV protection	Blocks up to 95% of UV rays (UPF50)
Hardware	Stainless steel corner D rings with heavy duty white webbing
Breathability	Water and air permeable (not waterproof)

Our Verdict

The ShadeMart 16' x 20' Blue Sun Shade Sail is a practical, cost-effective option for people who need large-area UV protection with good durability and airflow. It is particularly strong for patio, carport and RV shade where heat reduction and long-lasting hardware matter; buyers who require waterproof coverage or exact color/size precision should evaluate other options, but for breathable sun protection this sail represents solid value.

Frequently Asked Questions

Is this shade sail waterproof?
No. The fabric is water permeable and breathable, so it will not keep an area dry in rain.

How is the sail attached?
The corners use stainless steel D rings sewn into heavy duty white webbing for attachment to poles, trees, walls or anchor kits.

Will it block UV and reduce heat?
Yes. The woven HDPE fabric blocks up to 95% of harmful UV rays and typically lowers temperature under the sail by about 10 to 15 degrees.