ShadeMart 13ft x 21ft Red Rectangle Sun Shade Sail - Breathable UV

Our review of the ShadeMart 13' x 21' red rectangle shade sail finds it best for homeowners and small businesses who want a simple, durable way to cut heat and sun exposure outdoors. The biggest reason to buy is its combination of woven HDPE fabric and stainless steel corner D rings, which deliver a strong, breathable canopy that blocks up to 95% of harmful UV while allowing water and air to pass through. Installation is straightforward with basic hardware, and the sail doubles as a decorative solution for patios, carports or poolside areas.

Key Features

• Woven HDPE fabric: provides durable, tear-resistant coverage that reduces sun intensity and remains breathable in all weather.
• Stainless steel D rings: heavy-duty corner attachments are secured to white webbing for reliable anchoring and long-term strength.
• Water permeable design: lets rain and airflow pass through so water does not pool and the area stays ventilated.
• High UV protection: blocks up to 95% of harmful UV rays, helping lower temperatures by roughly 10 to 15 degrees beneath the sail.
• Custom sizing available: a selection of custom sizes helps match irregular venues when standard dimensions do not fit.
• Styling options: rectangle shape and multiple colors allow the sail to integrate with existing outdoor decor while adding shade.

Who It's For

The ShadeMart rectangle sail is ideal for homeowners with patios, pergolas, carports or poolside equipment who need cost-effective sun and UV protection without building permanent structures. It suits DIY installers who can attach the sail to posts, walls, trees or roofs using an appropriate hardware kit.

This sail is not for buyers who need full waterproof coverage or a fully rigid canopy; its water permeable weave is designed to breathe rather than keep out heavy rain. Also, those requiring precise factory-sewn dimensions should measure carefully since manual measurements can cause small variations.

Pros & Cons

Pros

• Strong material and stitching provide lasting durability and reliable shade coverage.
• Easy to install with common hardware and adaptable anchor points like poles or trees.
• Effective at lowering temperatures and blocking the majority of UV radiation.
• Good value compared with building permanent shade; customers reported satisfaction with quality and price.

Cons

• Not waterproof, so it will not protect against heavy rain or create a dry shelter.
• Manual measurement variations mean custom sizes may differ slightly from ordered dimensions.

Specifications

Our Verdict

The ShadeMart 13' x 21' red rectangle sail is a practical, affordable solution for adding shade and reducing heat in outdoor living areas. Its durable woven HDPE and stainless steel corners give it long-term usefulness, and the breathable design prevents water pooling while blocking most UV. Buy it if you want a flexible, decorative canopy for patios, carports or pool equipment; look elsewhere if you need a fully waterproof shelter.

Frequently Asked Questions

Is this shade sail waterproof?
No. The fabric is water permeable and breathable so water passes through rather than forming a waterproof barrier.

Can it be attached to trees or posts?
Yes. With the proper hardware kit the sail can be anchored to poles, trees, walls, roofs and similar structures.

How much UV protection does it provide?
The sail blocks up to 95% of harmful UV rays and meaningfully reduces temperature beneath the canopy.