ShadeMart 21 ft x 23 ft Black Rectangle Sun Shade Sail - Breathable UV

In this review the ShadeMart 21' x 23' Black Rectangle Sun Shade Sail is judged as a practical, heavy duty canopy for homeowners and light commercial users who need durable sun protection. The single biggest reason to buy is its combination of woven HDPE fabric and stainless steel corner D rings, which deliver long-lasting UV protection and secure anchoring without feeling flimsy. It performs well where airflow and water permeability are desired rather than complete waterproofing.

Key Features

• Woven HDPE fabric: The high density polyethylene weave blocks up to 95% of harmful UV rays while remaining breathable so it keeps shaded areas noticeably cooler.
• Stainless steel D rings: Heavy duty corner D rings attached to white webbing provide strong, corrosion-resistant anchor points for secure installations.
• Water and air permeable: The design allows rain and wind to pass through rather than pooling, which reduces stress on the canopy and the mounting points.
• Custom sizing available: ShadeMart offers custom sizes so the sail can be tailored to patios, carports, pergolas or garden areas when standard sizes do not fit.
• Rectangle styling: The simple rectangle shape integrates easily with existing outdoor layouts and can be used decoratively as well as functionally.
• Multiple mounting options: With appropriate hardware the sail can be anchored to poles, trees, walls or roofs for flexible placement.

Who It's For

The ShadeMart rectangle shade sail is best for homeowners, gardeners and small-business outdoor spaces that need reliable sun filtering without full waterproofing. It suits patios, carports, pergolas and poolside areas where airflow and temperature reduction are priorities.

It is not ideal for situations that require full rain protection or where absolute blackout shade is needed; shoppers who need a waterproof canopy or precise color/size matching should consider a different style or confirm custom sizing before purchase.

Pros & Cons

Pros

• Effective UV protection that blocks up to 95% of harmful rays and lowers temperatures.
• Durable construction with woven HDPE and reinforced white webbing for long service life.
• Stainless steel D rings provide reliable anchor points and resist corrosion.
• Allows water and air to pass through, preventing pooling and reducing wind load.

Cons

• Not waterproof, so it will not provide complete rain protection in heavy storms.
• Color and measured size can vary slightly due to manual measurements and fabric characteristics.

Specifications

Our Verdict

The ShadeMart 21' x 23' rectangle shade sail is a strong value for anyone needing durable, breathable sun protection that reduces heat and resists wear. It is particularly good for patios, carports and gardens where water permeability is preferable to pooling, and the reinforced corners and stainless hardware make installation reassuringly robust.

Frequently Asked Questions

Is this shade sail waterproof?
No. The fabric is water permeable and designed to allow water through rather than be fully waterproof.

How much UV protection does it provide?
The woven HDPE fabric blocks up to about 95% of harmful UV rays, helping lower temperatures beneath the canopy.

Can it be custom sized?
Yes. ShadeMart offers custom sizes but customers should measure their site carefully since manual measurements can cause slight variations.