ColourTree 21ft x 21ft x 21ft Black Triangle Sun Shade Sail - Heavy

Our review finds the ColourTree 21' x 21' x 21' black triangle sun shade sail best suited for homeowners and small commercial spaces seeking reliable sun protection with low maintenance. In this review the sail stands out for its heavy 190 GSM virgin HDPE fabric and laboratory-proven UV durability, which deliver long-lasting shade and reduced heat under the canopy. It is an excellent pick when you want a sturdy, breathable cover that blocks most UV without trapping water, and the included reinforced corners simplify attachment to existing posts or walls.

Key Features

• 190 GSM virgin HDPE: The thick non-recycled material gives stronger resistance to tearing and stretching compared with thinner or recycled fabrics.
• UV stabilized compound: Proven in 20,000 hours of UV lab testing to resist fading and drying, which helps preserve the sail's strength over time.
• 95% UV blockage: The woven fabric significantly reduces direct sunlight and UV exposure, making patios and pools more comfortable on hot days.
• Breathable, water-permeable weave: Air and rain pass through the material so water does not pool and the shaded area stays ventilated.
• Reinforced edges and stainless D-rings: Double-layer stitched seams and heavy stitching at corners keep the sail shaped and simplify secure installation.

Who It's For

The ColourTree triangle sun sail is ideal for homeowners with patios, balconies, carports or poolside areas who need a durable, long-lasting shade solution that maintains appearance in strong sun. It also suits cafes or small commercial outdoor seating that require high UV protection and low maintenance fabric.

It may be less suitable for someone who needs a quick-temporary shade for a single event where a lightweight, low-cost tarp would suffice, or for those who require pre-attached hardware since installation kits are sold separately and compatible mounting gear is recommended.

Pros & Cons

Pros

• Material quality and durability stand out thanks to the 190 GSM virgin HDPE and UV-stabilized treatment.
• Excellent UV protection reduces temperature and sun exposure in shaded areas.
• Breathable fabric prevents water pooling during rain and improves airflow beneath the sail.
• Stainless steel D-rings and reinforced seams make for a solid, long-lasting attachment points.

Cons

• Installation hardware is not included, so buyers must purchase compatible kits and cables separately.
• As a heavy-duty fabric, the sail requires proper tensioning and sturdy anchor points, which can make DIY setup slightly more involved.

Specifications

Shape	Right triangle
Size	21 ft x 21 ft x 21 ft
Fabric weight	190 GSM
Material	100% virgin HDPE (UV stabilized)
UV blockage	Approximately 95%
Corner fittings	Stainless steel D-rings with extra heavy stitching
Warranty	3 years limited

Our Verdict

The ColourTree 21' triangle sun shade sail is a practical long-term solution for residential and small commercial shade needs; its 190 GSM virgin HDPE and UV-stabilized compound provide tangible durability and sun protection that justify the investment. Buy this if you want a breathable, fade-resistant canopy that holds up under strong sun and reduces heat below, but plan to get proper hardware and sturdy anchor points for best results.

Frequently Asked Questions

Does this sail block most UV?
Yes, the woven fabric is designed to block about 95% of harmful UV rays while remaining breathable.

Is hardware included?
No, installation hardware kits and cable ropes are sold separately and are required for proper mounting.

How long is the warranty?
The product includes a 3 year limited warranty under normal weather and usage.