ShadeMart 17 ft x 23 ft Black Sun Shade Sail UPF50 Rectangle - Heavy

In this review the ShadeMart 17' x 23' black rectangle sun shade sail earns a recommendation for homeowners and RV owners who need a large, durable canopy that blocks sun and lowers temperatures. The single biggest reason to buy is its effective sun protection: the woven HDPE fabric blocks up to 95% of harmful UV and cuts temperature in the shaded area by roughly 10 to 15 degrees, making it a practical choice for patios, carports, and outdoor vehicle cover. The reviewer found the materials and construction focused on durability and weather performance rather than being fully waterproof.

Key Features

• Woven HDPE fabric: The high density polyethylene weave provides a breathable screen that blocks UV while allowing air and water to pass through, reducing heat buildup under the canopy.
• Stainless steel corner D-rings: Rust-resistant D-rings at each corner simplify attachment to posts, trees, or walls and hold up in damp conditions without corroding.
• Reinforced double webbing: All edges are finished with double layered stitched seams to prevent fraying and improve long-term tension under load.
• Significant UV protection: With up to 95% UV blockage the sail noticeably lowers sun exposure, making it useful for shading patios, pools, and vehicles.
• Water and air permeable: The fabric sheds heavy pooling by letting water pass through and keeps airflow, so it performs well in rain without acting as a solid roof.
• Custom sizing available: A range of custom sizes is offered so customers can match unique venues, provided they measure carefully before ordering.

Who It's For

The ShadeMart 17' x 23' rectangle sail is best for homeowners, RV owners, and small business outdoor spaces that need large-area shade and UV protection without a permanent roof. It suits people who value breathability and reduced temperature rather than complete waterproofing, and those who can install attachment points like posts or wall anchors.

It is less suitable for buyers who need a fully waterproof canopy or a small, portable sunshade for occasional use; those customers should consider solid tarp-style covers or smaller portable umbrellas. Also, precise measuring and basic hardware or a kit are required for a good installation.

Pros & Cons

Pros

• Built with woven HDPE and reinforced seams for long-lasting sun resistance and reduced fraying.
• Stainless steel D-rings resist rust and make attachment straightforward.
• Effectively blocks up to 95% of UV and lowers shaded temperatures by about 10 to 15 degrees.
• Breathable, water-permeable design helps avoid pooled water during rain.

Cons

• Not waterproof, so it will not keep out heavy rain if a dry cover is required beneath.
• Color options and exact fit can vary; customers report color mix feedback and must measure carefully for custom sizes.

Specifications

Brand	ShadeMart
Shape	Rectangle
Size	17' x 23'
Material	Woven HDPE (high density polyethylene)
Corner Hardware	Stainless steel D-rings with heavy duty webbing
UV Protection	Blocks up to 95% of UV rays (UPF50)
Permeability	Water and air permeable (not waterproof)

Our Verdict

The ShadeMart 17' x 23' rectangle sun shade sail is a solid value for anyone needing durable, large-area UV protection that also breathes and sheds water. Its reinforced edges and stainless steel D-rings translate to reliable performance in wind and sun, while the custom size option helps fit unusual spaces. Buy this if you want strong sun protection and reduced temperatures outdoors; look elsewhere if you require a fully waterproof canopy.

Frequently Asked Questions

Is this shade sail waterproof?
The fabric is water and air permeable, so it is not waterproof and will allow water to pass through rather than creating a dry roof.

Will the hardware resist rust?
Yes, the corners use stainless steel D-rings which are rust resistant and attached to heavy duty webbing for durability.

Can I order a different size?
ShadeMart offers custom sizes, but accurate measurements are important since shade sails may vary slightly due to manual measurement during production.