13ft x 21ft Green Sun Shade Sail Rectangle - Durable UV Block Canopy

Our review of the ShadeMart 13' x 21' Green Sun Shade Sail finds it best for homeowners and small businesses who want reliable sun protection without a permanent structure. The biggest reason to buy is its combination of durable woven HDPE fabric and stainless steel corner D rings, which deliver strong, breathable shade that reduces temperature and blocks up to 95% of UV. Installation is straightforward for DIYers with basic hardware, and the fabric's water permeability means it performs well in sun and light rain while keeping airflow under the canopy.

Key Features

• Material: Woven HDPE fabric provides a tear-resistant canopy that stands up to outdoor use and holds shape well over time.
• Hardware: Stainless steel corner D rings attached to heavy duty white webbing give secure anchor points for reliable mounting.
• UV Protection: Blocks up to 95% of harmful UV rays, helping reduce temperatures under the sail by an appreciable margin.
• Breathable Design: Water permeable and breathable fabric allows rain and air to pass through so puddles do not form and ventilation is maintained.
• Custom Size Option: Available in a range of custom sizes so buyers can match the sail to patios, carports, pools, or pergolas when measured accurately.

Who It's For

This shade sail is ideal for homeowners seeking a cost-effective way to add shade to a patio, carport, poolside, or yard, and for small businesses needing temporary sun cover without a heavy installation. It suits DIYers who can attach the sail to walls, poles, trees or existing structures using appropriate hardware.

It is not for buyers who need a waterproof canopy or those looking for a rigid, permanent roofing solution; in heavy storm conditions a solid roof or waterproof awning would be more appropriate.

Pros & Cons

Pros

• High quality woven HDPE fabric and strong stitching create a durable shade surface praised by customers for material strength.
• Stainless steel D rings and heavy duty webbing simplify secure mounting and resist corrosion.
• Effectively reduces temperature and blocks a large percentage of UV, delivering noticeable comfort improvements.
• Breathable design prevents water pooling and maintains airflow beneath the sail.

Cons

• Not waterproof, so it will not keep out heavy rain and is intended primarily for sun protection.
• Size may vary slightly due to manual measurement, so careful measuring is required before ordering.

Specifications

Our Verdict

The ShadeMart 13' x 21' Green Sun Shade Sail is a sensible, cost-effective option for anyone needing reliable sun protection that also allows airflow and drainage. Its durable HDPE fabric and stainless steel corner fittings make it a practical choice for patios, carports, and pool areas, offering strong value for money as long as waterproofing is not required.

Frequently Asked Questions

Is this shade sail waterproof?
No, the fabric is water permeable and breathable, so it allows water to pass through rather than providing a waterproof cover.

Can I attach the sail to trees or poles?
Yes, with the proper hardware kits the sail can be attached to poles, trees, walls, or roofs as long as anchors are secure.

How much UV protection does it provide?
The sail blocks up to 95% of harmful UV rays, which helps lower temperatures under the canopy.