ShadeMart 21ft x 23ft Sand Beige Sun Shade Sail Rectangle - UPF50

In this review the ShadeMart 21' x 23' Sand Beige Sun Shade Sail is examined for homeowners and outdoor-space improvers who need broad sun protection without trapping heat. The bottom line: this woven HDPE rectangle sail delivers durable, breathable shade and blocks up to 95% of UV while remaining water permeable, making it a strong choice for patios, carports and poolside cover where airflow and UV reduction matter most.

Key Features

• Woven HDPE fabric: Provides long-lasting shade that resists tearing and helps keep temperatures lower under the sail.
• UPF50 sun protection: Blocks up to 95% of harmful UV rays so furniture, vehicles and people receive meaningful sun protection.
• Water and air permeable: Allows rain and breeze to pass through, preventing pooling and improving ventilation in hot weather.
• Stainless steel D rings: Reinforced corner hardware attached to heavy duty webbing for secure anchoring to posts, walls or trees.
• Custom sizing available: A range of sizes can be ordered to fit unconventional spaces when standard dimensions are not suitable.
• Stylish rectangle shape: Simple geometry that integrates with many outdoor designs and can be layered for visual interest.

Who It's For

The ShadeMart rectangle sail is best for homeowners, renters and small business owners who need broad, breathable shade over patios, carports, pergolas or pool areas and value UV protection and airflow over full waterproofing. It works well for protecting RVs, outdoor furniture and creating a cooler seating area without disrupting cross breezes.

Those who need a fully waterproof canopy, a rigid roof structure, or an exact color match should look elsewhere; the fabric is intentionally water permeable and customers report mixed experiences with the advertised color and stated measurements, so careful measuring and color checks are advised before purchase.

Pros & Cons

Pros

• Effective UV blockage and noticeable temperature reduction beneath the sail.
• Durable woven HDPE construction that stands up to wind and sunlight without quick fading.
• Breathable design prevents water pooling and improves comfort in warm weather.
• Stainless steel corner D rings and heavy webbing aid secure installation with proper hardware.

Cons

• Not waterproof by design, so it will not keep out rain completely.
• Some customers report color and size variation, so measure carefully and expect slight differences.

Specifications

Brand	ShadeMart
Shape	Rectangle
Size	21 ft x 23 ft
Material	Woven HDPE (High Density Polyethylene)
UV Protection	UPF50, blocks up to 95% of UV rays
Hardware	Stainless steel corner D rings with heavy duty white webbing
Water Resistance	Water permeable, not waterproof

Our Verdict

The ShadeMart 21' x 23' rectangle sail is a solid, value-oriented option for anyone seeking durable, breathable sun protection that significantly reduces UV exposure and temperature under the canopy. It is particularly good for patios, carports and RV protection where airflow matters; just verify color expectations and exact measurements before ordering a custom size.

Frequently Asked Questions

Is this shade sail waterproof?
The fabric is water permeable and designed to allow rain through, so it is not a waterproof canopy.

Will it block UV and reduce temperature?
Yes, the sail has UPF50 protection and blocks up to 95% of UV, which customers report lowers temperatures noticeably beneath the sail.

Can it be attached to different structures?
With the right hardware kits it can be mounted to poles, trees, walls or roofs and used over patios, carports, pergolas and pools.