ShadeMart 13ft x 21ft Grey Sun Shade Sail UPF50 Rectangle - Cool

In this review the ShadeMart 13' x 21' grey rectangle sun shade sail is evaluated for homeowners and small business owners who need broad, breathable UV protection without a solid roof. The bottom line: this woven HDPE canopy is best for reducing heat and protecting outdoor spaces from sun exposure while remaining water permeable. The reviewer found it durable, effective at blocking sunlight, and straightforward to install when paired with proper hardware, making it a practical choice for patios, carports, and poolside shade.

Key Features

• Material: Woven HDPE fabric provides a tough, tearresistant surface that resists fading and holds up in outdoor conditions.
• UV Protection: UPF50 construction blocks up to 95% of harmful UV rays, noticeably lowering ambient temperature under the sail.
• Breathability: The water permeable design allows rain and air to pass through, preventing water pooling and improving airflow on hot days.
• Hardware Ready: Stainless steel corner D rings attached to heavy duty webbing give secure anchoring points when used with suitable mounting kits.
• Custom Sizing: Multiple sizes and customization options are available so the sail can be tailored to fit patios, carports, or pool areas when measured accurately.

Who It's For

This shade sail is ideal for homeowners, renters with permissive mounting options, and small businesses seeking a cost effective way to reduce sun and heat on decks, patios, pergolas, and carports. It suits projects where airflow and UV protection are priorities and when a nonwaterproof, breathable cover is acceptable.

People who need a fully waterproof canopy, a perfectly rigid shape, or precision industrial mounting should look elsewhere; this product is designed as a flexible fabric solution that works best with the right anchors and some onsite adjustment for shape and tension.

Pros & Cons

Pros

• High UV blockage gives substantial cooling and sun protection for outdoor seating and vehicles.
• Durable woven HDPE and stainless steel D rings create a robust sail that stands up to regular use.
• Breathable, water permeable weave prevents ponding and improves comfort on warm days.
• Custom size options make it adaptable to many spaces when measured carefully.

Cons

• Not waterproof, so it will not protect against heavy rain like a solid canopy would.
• Size and rectangular symmetry can vary with manual measurement; some customers report fit differences.

Specifications

Brand	ShadeMart
Shape	Rectangle
Size	13ft x 21ft (nominal)
Material	Woven HDPE (High Density Polyethylene)
UV Rating	UPF50, blocks up to 95% UV
Water Resistance	Water permeable, not waterproof
Hardware	Stainless steel corner D rings with heavy duty webbing

Our Verdict

The ShadeMart 13' x 21' rectangle sun shade sail is a practical, value oriented choice for anyone who needs reliable sun protection and improved airflow in outdoor spaces. It is especially good for patios, carports, and poolside areas where waterproofing is not required; when measured and mounted correctly it delivers durable coverage, good UV blocking, and easy integration with standard hardware kits.

Frequently Asked Questions

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

How much UV protection does it provide?
ShadeMart lists a UPF50 rating and claims the sail blocks up to 95% of harmful UV rays.

Can it be custom sized?
Yes, the manufacturer offers custom sizes, but accurate measurement is important and manual measurement may cause slight variation in shape.