12x21 ft Sun Shade Cloth 95% UV Protection - Pergola Cover Silver

Our review of the 12x21 ft sun shade cloth finds it best for homeowners who need a large, breathable cover for a pergola, patio or carport. The single biggest reason to buy is the combination of heavy-duty HDPE knit and reinforced, double-sewn edges with copper grommets that allow quick mounting and long-term weather resistance. It blocks up to 95% of UV while still allowing airflow and water to pass through, so it keeps spaces cooler without creating a greenhouse effect.

Key Features

• Durable HDPE construction: The high density polyethylene knit resists tearing and fraying, making the panel suitable for regular outdoor exposure.
• Reinforced edges and grommets: Double-sewn hems and copper grommets placed every 2 ft provide secure anchor points for hanging or tying down the shade.
• 95% UV protection: The fabric blocks most sunlight to reduce heat and UV exposure while preserving breathability and allowing water to drain.
• Easy installation: Included zip ties and ropes let one person attach the shade to a frame or posts without extra tools.
• Versatile use: With an 85%-90% shading rate it works for pergolas, patios, gazebos, carports, and also as a privacy screen or wind barrier.
• Custom sizing available: The manufacturer offers tailored sizes and color options to fit nonstandard openings.

Who It's For

This size and style is ideal for homeowners with medium to large pergolas, covered patios or carports needing substantial sun and UV reduction. It also suits gardeners and pet owners who need a breathable cover for shade in a greenhouse, coop, or kennel.

It is less suitable for someone who needs a fully waterproof canopy or a rigid structure; the fabric allows water to pass through and the length tolerance of about 2 in means exact-fit fixed frames may require adjustment. Users who need professional-grade marine hardware should consider heavier mounting solutions.

Pros & Cons

Pros

• High-quality HDPE fabric offers long-term durability and resists fraying.
• Reinforced double hems and copper grommets increase mounting reliability.
• Blocks about 95% of UV while remaining breathable and reducing heat buildup.
• Simple installation using the included zip ties or ropes saves time and tools.

Cons

• Some users report grommets can tear if mounted without care or overly tight tension.
• Not fully waterproof-water will drip through the knit fabric rather than bead off.

Specifications

Our Verdict

For anyone needing a large, breathable shade cover that blocks most UV and is easy to install, the 12x21 ft sun shade cloth is a practical, value-driven choice. Its durable HDPE fabric and reinforced hems make it a sensible option for pergolas, patios and carports, while custom sizing options add flexibility. Buyers who require waterproofing or heavy-duty marine-grade mounting should look elsewhere.

Frequently Asked Questions

Will this shade block rain?
Answer. The knit fabric is breathable and allows water to pass through rather than forming a waterproof barrier.

How is it attached?
Answer. The package includes zip ties and ropes and copper grommets are spaced about every 2 ft for fastening to a structure.

Can I order a different size or color?
Answer. Yes, customized sizes and color options are available from the maker to fit nonstandard openings.