ShadeMart 17 ft x 21 ft Brown Sun Shade Sail UPF50 Rectangle - Durable

In this review the ShadeMart 17 ft x 21 ft brown sun shade sail is assessed for homeowners and small commercial spaces seeking a durable, breathable canopy that significantly reduces sun exposure. The bottom line: this woven HDPE rectangle shade sail is best for patios, carports, poolside areas or vegetable gardens where UV protection and airflow matter more than full waterproofing. Its strongest selling point is reliable sun blockage and temperature reduction while remaining easy to install with its reinforced corners.

Key Features

• Woven HDPE fabric: the material blocks up to 95% of harmful UV rays while staying breathable so heat buildup is reduced.
• Stainless steel D rings: heavy duty corner hardware is attached to white webbing for secure anchor points and long-term durability.
• Water and air permeable: the sail lets rain and breeze pass through, preventing pooling and reducing wind stress on the fabric.
• Custom size options: a range of sizes is available so buyers can choose or request dimensions that match their patio, pergola or carport.
• Rectangle styling: the simple shape integrates with many outdoor designs and provides broad, even shade coverage for seating and planting areas.
• Low maintenance: the synthetic weave resists rot and tears, making it suitable for seasonal and year-round outdoor use.

Who It's For

This shade sail is a good match for homeowners who need effective sun protection for patios, poolsides, vegetable gardens or carports and who prioritize airflow and UV blocking over complete waterproofing. It also fits DIY installers who can mount the sail to posts, walls or trees using proper hardware kits.

It is less suitable for buyers who require a fully waterproof canopy or a rigid permanent structure; those customers should look for waterproof awnings or hard patio covers instead. Also measure carefully before ordering a custom size because fabric dimensions vary slightly with manual measurement.

Pros & Cons

Pros

• Blocks up to 95% of UV rays, noticeably lowering temperatures in shaded areas.
• Breathable HDPE weave prevents water pooling and reduces wind load on the sail.
• Stainless steel D rings with heavy duty webbing provide secure attachment points and strong stitching.

Cons

• Not waterproof, so it will not keep an area dry in heavy rain.
• Color and size may vary slightly due to manual measurements and dye differences.

Specifications

Our Verdict

The ShadeMart 17 ft x 21 ft rectangle shade sail is a practical, value-minded choice for anyone who needs reliable sun protection and airflow for patios, pools or gardens. Its durable woven HDPE, reinforced corners and ease of installation make it a strong option where UV blocking and breathability are priorities; buyers seeking full waterproofing should consider alternative covers.

Frequently Asked Questions

Is this shade sail waterproof?
No. The fabric is water permeable and breathable, so it will not keep an area dry in heavy rain.

Can it be attached to trees or posts?
Yes. With appropriate hardware kits the sail can be mounted to poles, trees, walls or roofs.

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