ShadeMart 12 ft x 18 ft Blue Sun Shade Sail - UPF50 Rectangle

In this review of the ShadeMart 12 ft x 18 ft Blue Sun Shade Sail, the bottom line is simple: it is a durable, breathable rectangle canopy for homeowners who want reliable sun protection and cooler outdoor space without a hard structure. The reviewer finds the sail is best for patios, carports, pergolas and poolside areas where airflow and UV blocking matter, and highlights the UPF50 protection and woven HDPE fabric as the single biggest reason to buy. Installation is straightforward with proper hardware, and the fabric reduces heat noticeably while remaining water permeable.

Key Features

• Material: Woven HDPE fabric provides a strong, tear-resistant canopy that stands up to regular outdoor exposure.
• UV protection: Blocks up to 95% of harmful UV rays with a UPF50 rating to significantly lower surface temperatures beneath the sail.
• Breathability: Water permeable and air-permeable construction allows rain and breeze to pass through, reducing wind load and pooling during showers.
• Hardware-ready corners: Stainless steel D rings attached to heavy duty white webbing offer secure anchor points for a variety of mounting options.
• Custom sizing: Available in multiple sizes and custom options so buyers can order a sail cut to fit irregular patios or larger outdoor areas.
• Styling: Rectangle shape and color choices let the sail serve as both functional shade and an aesthetic addition to outdoor decor.

Who It's For

This ShadeMart rectangle sail is ideal for homeowners and renters who want effective sun protection over patios, carports, pergolas, pools or yard seating without installing a permanent roof. It is especially useful where airflow matters - around pools or open patios - because the fabric is water permeable and reduces trapped heat.

Buyers who need a fully waterproof cover, an exact factory-cut geometric rectangle without any size variance, or integrated mounting hardware included should look elsewhere or plan to buy a dedicated hardware kit separately. Accurate on-site measurement is important when ordering custom sizes.

Pros & Cons

Pros

• High-density woven HDPE feels sturdy and resists wear, contributing to long-term durability.
• Blocks up to 95% of UV rays and lowers temperatures beneath the sail for a more comfortable outdoor area.
• Water permeable design prevents pooling and reduces wind stress while allowing ventilation.
• Stainless steel D rings and heavy webbing create secure anchor points for common mounting setups.

Cons

• Not waterproof, so it will not provide full rain protection in a downpour.
• Some customers report size variance or non-perfect rectangle shapes from manual measurements, so careful measuring is required.

Specifications

Our Verdict

The ShadeMart 12 ft x 18 ft Blue Sun Shade Sail is a practical, cost-effective choice for shading patios, carports and pool areas where sun protection and airflow are priorities. With strong woven HDPE fabric, stainless steel corner fittings and solid UPF50 coverage, it delivers good value for buyers who accept that it is water permeable rather than waterproof and will require accurate measurement for custom orders.

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 acting as a waterproof tarp.

How much UV protection does it provide?
The sail offers UPF50 protection and can block up to 95% of harmful UV rays, helping lower temperatures beneath the canopy.

Can it be attached to trees or poles?
Yes. With proper hardware kits, the stainless steel D rings and webbing allow attachment to poles, trees, walls, roofs and other structures.