Rainbow Rectangle Waterproof Sun Shade Sail 4 ft x 17 ft - UPF50

In this review of the Rainbow Rectangle Waterproof Sun Shade Sail, the bottom line is clear: this sail is for homeowners or renters who need strong sun and light rain protection across a long, narrow area such as a patio walkway or carport. The sail's standout trait is its combination of waterproof polyester with a PU coating and high UV blockage that claims up to 98% protection, which makes it a practical choice when shade and heat reduction are priorities rather than a decorative canopy alone.

Key Features

• Waterproof PU coating: The polyester body with a PU layer repels light rain and wind, keeping the area beneath drier than an uncoated fabric.
• High UV blockage: The sail blocks up to 98% of harmful rays and helps reduce temperature by as much as 15 degrees compared to unshaded spots.
• Sturdy reinforced corners: Each corner includes a stainless steel D-ring and dual-layered webbing to resist fraying and reduce sag over time.
• Curved edges and webbing: The design minimizes loose material and improves tension distribution for a neater, longer-lasting installation.
• Custom sizing: The manufacturer offers custom orders and a three-year limited warranty, useful when standard sizes do not fit a space.

Who It's For

This sail suits people who need a narrow, elongated shade for backyard paths, patios, carports or garden seating that benefits from measurable heat reduction and strong UV protection. It is especially useful where heavier sun exposure is a concern and where a water-resistant surface is preferred over a plain fabric.

People who want a completely maintenance-free waterproof canopy or expect perfect pooling resistance in heavy, prolonged storms should consider a rigid roof or purpose-built awning instead, since this fabric-based sail requires a slight tilt to shed water and may collect pooling if installed flat.

Pros & Cons

Pros

• High UV blockage gives substantial sun protection and noticeable temperature reduction beneath the sail.
• Waterproof PU coating offers resistance to light rain and wind when installed with proper tilt.
• Reinforced corners and stainless steel D-rings improve durability and make secure anchoring easier.
• Custom-size options and a three-year limited warranty provide buying flexibility and reassurance.

Cons

• Performance against heavy rain is mixed; water pooling can occur if the sail is not tilted correctly or tensioned well.
• Hardware is not included, so buyers must purchase a separate Shade Sail Hardware Kit for best results.

Specifications

Our Verdict

The Rainbow Rectangle sail is a solid value for buyers who need a long, narrow shade with strong UV protection and reasonable water resistance; its reinforced corners and custom-size options make it versatile for patios and carports. Those who need guaranteed performance in heavy storms should pair it with proper hardware and pitch it steeply or choose a rigid shelter instead.

Frequently Asked Questions

Is the sail fully waterproof?
It has a PU waterproof coating that repels light rain when installed with a tilt, but heavy or pooled water can leak through or accumulate if flat.

Does the hardware come with the sail?
No, the deck hardware kit is not included; the manufacturer recommends using a Shade Sail Hardware Kit for secure installation.

Can I order a different size?
Yes, custom sizes are available and purchases come with a 30-day return window plus a 3-year limited warranty.