ShadeMart 10 ft x 21 ft Green Rectangle Sun Shade Sail - UPF50

In this review of the ShadeMart 10' x 21' Green Sun Shade Sail, the bottom line is straightforward: this is a practical, heavy-duty shade fabric for homeowners who want reliable UV protection and airflow for patios, carports or pool areas. The biggest reason to buy is the fabric's woven HDPE construction which delivers UPF50 sun protection while remaining water permeable, so it reduces heat without trapping moisture. The sail suits outdoor spaces where long-lasting shade and breathability matter more than full waterproofing.

Key Features

• Material: Woven HDPE fabric provides a durable, tear-resistant canopy that stands up to regular outdoor use.
• UV Protection: Blocks up to 95% of harmful UV rays to significantly lower temperatures beneath the sail.
• Water Permeable: The breathable design allows water and air to pass through so rain drains instead of pooling on the fabric.
• Hardware Ready: Reinforced corners use stainless steel D rings attached to heavy duty webbing for secure mounting to poles, walls or trees.
• Custom Size Options: Available in multiple sizes and custom cuts so buyers can match the sail area to irregular spaces.
• Decorative Styling: The rectangle shape and color options make it easy to integrate the sail into existing outdoor design schemes.

Who It's For

The ShadeMart 10' x 21' sail is a good fit for homeowners with patios, carports, pergolas or poolside seating who need reliable sun protection and airflow rather than a waterproof shelter. It works well where trees, posts or building anchors are available and where a breathable canopy will reduce temperatures by roughly 10 to 15 degrees.

It is not intended for buyers who need a fully waterproof awning or an exact precision-cut industrial canopy; customers should measure carefully because shade sails are subject to manual measurement variance and the product emphasizes area over exact corner coordinates.

Pros & Cons

Pros

• Durable woven HDPE fabric resists wear and held up for customers in harsh weather.
• Effective sun protection that blocks most UV and noticeably cools shaded areas.
• Breathable, water-permeable design prevents pooling and improves comfort in warm weather.
• Stainless steel D rings and heavy webbing simplify secure installations.

Cons

• Not waterproof, so it will not keep out heavy rain for covered living spaces.
• Size and shape can vary slightly due to manual measurement, so exact rectangle precision is not guaranteed.

Specifications

Brand	ShadeMart
Model Size	10' x 21' (rectangle)
Material	Woven HDPE (High Density Polyethylene)
UV Rating	Blocks up to 95% UV (UPF50)
Water	Water permeable / breathable (not waterproof)
Corner Fittings	Stainless steel D rings on heavy duty webbing
Custom Options	Available in multiple sizes; custom sizing offered

Our Verdict

The ShadeMart 10' x 21' Green Sun Shade Sail is a solid value for anyone seeking robust UV protection and breathable shade for patios, carports or pools. It combines durable HDPE fabric with reinforced corners and practical water permeability, making it a sensible choice when waterproofing is not required and custom sizing options are useful.

Frequently Asked Questions

Is this sail waterproof?
No, the sail is water permeable and breathable; it allows water to pass through instead of acting as a waterproof cover.

How much sun protection does it provide?
The fabric blocks up to 95% of harmful UV rays (UPF50) and will noticeably reduce temperatures beneath the canopy.

Can it be mounted to trees or poles?
Yes, the corners have stainless steel D rings attached to heavy webbing and can be anchored to poles, trees, walls or roofs with appropriate hardware.