ShadeMart 18 ft x 21 ft Turquoise Rectangle Sun Shade Sail - Cool UV

In this review of the ShadeMart 18' x 21' Turquoise Sun Shade Sail the bottom line is simple: it is a practical, heavy duty fabric canopy for anyone who needs reliable sun protection without a solid roof. The sail is best for patios, carports, pergolas and gardens where airflow and UV blocking matter more than full waterproofing. The single biggest reason to buy is its woven HDPE construction and stainless steel corner D rings, which deliver durable sun protection and easy attachment to poles, walls or trees.

Key Features

• Woven HDPE fabric: the material lets air and water pass through while still blocking up to 95% of harmful UV rays for cooler shaded areas.
• Stainless steel D rings: heavy duty corner rings attached with white webbing provide strong anchor points for long lasting installation.
• Breathable design: water permeable construction prevents pooling and reduces wind stress compared with solid covers.
• Temperature reduction: users report significantly lower temperatures under the sail, making outdoor spaces more comfortable in direct sun.
• Custom size options: a range of sizes is offered so buyers can pick or tailor a sail to fit patios, carports, pools and other venues.
• Decorative rectangle shape: the turquoise color and clean rectangular styling integrate with many outdoor designs while providing practical shade.

Who It's For

The ShadeMart rectangle shade sail is ideal for homeowners or renters who want an affordable, long lasting way to reduce sun exposure over patios, vegetable gardens, poolside seating and carports. Installers who plan to attach the sail to existing structures, poles or trees will appreciate the reinforced corners and stainless steel D rings.

It is not the right choice for someone who needs a waterproof canopy or a fully enclosed shelter; the sail is explicitly water permeable and designed to breathe rather than shed heavy rain. Those seeking a rigid or fully waterproof cover should look at other products.

Pros & Cons

Pros

• Effective UV blocking and noticeable cooling under the fabric.
• Durable materials with woven HDPE cloth and stainless steel corner hardware.
• Breathable, water permeable design avoids water pooling and reduces wind load.
• Multiple sizes and colors allow customization for many outdoor settings.

Cons

• Not waterproof, so it will not keep rain out during heavy storms.
• Color and exact measurements can vary slightly due to manual production and sizing.

Specifications

Brand	ShadeMart
Shape	Rectangle
Size	18' x 21'
Material	Woven HDPE (High Density Polyethylene)
Hardware	Stainless steel corner D rings with heavy duty white webbing
Water resistance	Water permeable (not waterproof)
UV protection	Blocks up to 95% of UV rays

Our Verdict

The ShadeMart 18' x 21' Turquoise Rectangle Sun Shade Sail is a sensible value for anyone needing breathable, UV-resistant shade that installs to existing structures. Its durable HDPE fabric and reinforced corners make it a reliable choice for patios, carports and gardens, but buyers should not expect waterproof performance.

Frequently Asked Questions

Is this shade sail waterproof?
This style is water permeable and breathable, so it will not be fully waterproof during heavy rain.

What hardware is used at the corners?
Each corner has a stainless steel D ring attached to heavy duty white webbing for secure anchoring.

Can I get a different size?
ShadeMart offers custom sizes; measure your venue carefully before ordering since manual measurements can cause slight variation.