ShadeMart 11ft x 21ft Grey Sun Shade Sail UPF50 Rectangle - Cool

In this review of the ShadeMart 11' x 21' grey rectangle sun shade sail, the bottom line is simple: it is a practical, heavy-duty canopy for anyone wanting reliable sun protection and airflow rather than full waterproofing. The sail's woven HDPE fabric with stainless steel D rings and reinforced webbing delivers a stable, long-lasting cover that blocks most UV while allowing water and breeze to pass through; that combination makes it ideal for patios, carports, and poolside shading where heat reduction and durability matter most.

Key Features

• Woven HDPE fabric: provides a durable, UV resistant canopy that blocks up to 95% of harmful sunlight while remaining breathable.
• Stainless steel D rings: are attached to heavy duty webbing to give secure anchor points that resist rust and hold tension well.
• Water permeable design: lets rain and air pass through the cloth, reducing pooling and wind stress on the installation.
• Heat reduction: the fabric significantly lowers temperatures beneath the sail, creating a cooler outdoor area for seating or vehicle shade.
• Custom size options: the brand offers tailored dimensions so installations can be matched to specific patios, carports, or pool decks.
• Rectangle styling: fits common architectural layouts and integrates cleanly with existing poles, walls, or trees.

Who It's For

This shade sail suits homeowners and small businesses that need effective solar protection over patios, pergolas, carports or pool areas and prefer a breathable, water-permeable fabric over a waterproof tarp. Installers who value corrosion-resistant hardware and reinforced corners will appreciate how the sail holds tension and stands up to weather.

It is less appropriate for buyers who need a fully waterproof canopy or an exact precision-cut rectangle without any manual-measurement variance; customers who require total rain protection or exact dimensional tolerances should consider alternative shelter solutions.

Pros & Cons

Pros

• High UV protection from the woven HDPE cloth keeps shaded areas noticeably cooler.
• Durable construction with stainless steel D rings and heavy webbing supports long service life and secure mounting.
• Water permeable design prevents pooling and reduces wind-related stress on the fabric and anchors.
• Custom sizing and simple rectangle styling make it adaptable to many outdoor layouts.

Cons

• Not waterproof, so it will not keep an outdoor area fully dry during heavy rain.
• Size and shape can vary slightly due to manual measurements, which may require careful measuring before ordering.

Specifications

Brand	ShadeMart
Shape	Rectangle
Size	11' x 21'
Material	Woven HDPE (High Density Polyethylene)
Hardware	Stainless steel D rings with heavy duty webbing
Function	Water permeable and UV resistant (blocks up to 95% UV)

Our Verdict

The ShadeMart 11' x 21' grey rectangle shade sail is a solid, value-minded choice for anyone seeking effective sun protection with breathable, durable materials. It is best for patios, carports and pool areas where water permeability and corrosion-resistant anchors matter, and it offers good longevity and heat reduction as long as full waterproofing is not required.

Frequently Asked Questions

Is this shade sail waterproof?
The fabric is water permeable and not waterproof, so it allows rain to pass through rather than provide a dry sheltered area.

How much UV protection does it provide?
The woven HDPE material blocks up to 95% of harmful UV rays, reducing sunlight and lowering temperatures beneath the sail.

Can it be custom sized?
Yes, the manufacturer offers a range of custom sizes; measure your venue carefully because manual measurements can cause slight size variations.