SUNLAX 16' x 20' Sand Rectangle Sun Shade Sail — 95% UV Block, Breathable HDPE Outdoor Canopy

The SUNLAX 16' x 20' sand rectangle sun shade sail is a high-density polyethylene outdoor canopy that blocks up to 95% of UV while allowing cooling airflow.

This large rectangle shade sail from SUNLAX offers broad, reliable solar protection for patios, decks, pools, and gardens. Knit from durable high-density polyethylene (HDPE) without recycled content, the fabric balances sun-blocking performance and breathability so spaces beneath stay cooler without trapping moisture. Built with reinforced seams and rust-resistant hardware, the sail is designed for seasonal use and can be installed with standard anchors or SUNLAX accessories (sold separately).

How well does this cover block sun and UV rays?

The SUNLAX shade sail is engineered for strong UV reduction, offering approximately 90%–95% shading for most colors (80%–85% for the white series). The knitted mesh disperses sunlight while still allowing light and air to pass through, reducing heat buildup under the sail.

• Shading rate: ~90%–95% (white: ~80%–85%)
• Material: high-density polyethylene (HDPE), no recycled fibers
• UV protection: reduces direct sun exposure significantly
• Design allows airflow to keep shaded area cooler

What features help it last outdoors?

Durability comes from careful construction: the fabric is cut from full panels and finished with double-stitched seams to resist fraying. Each corner is fitted with anti-rust D-rings and the sail features a curved edge to maintain tension and reduce sagging over time.

• Double-strength stitched seams for reinforced edges
• Four anti-rust D-rings (one per corner) for secure anchoring
• Curved-edge design prevents pooling and sagging
• HDPE fabric resists tearing under normal outdoor stress

How do I install and size this shade sail correctly?

Measure from outer edge of one D-ring to the outer edge of the opposite D-ring; allow a tolerance of up to ±4 feet because of fabric characteristics. For hardware, leave about 0.5–1 foot between the sail edge and each fixed anchor to accommodate hooks, turnbuckles, or rope—SUNLAX recommends using its dedicated accessories for best results.

• Measured size: D-ring to D-ring—expect ±4 ft tolerance
• Install clearance: leave 0.5–1 ft for mounting hardware
• Accessories: anchors and tensioners not included (available separately)
• Quick setup with provided cords; heavy-duty fasteners advised

Is this shade sail waterproof or suitable in rain?

This product is a shade canopy, not a waterproof tarp; the knitted mesh permits raindrops to pass through rather than shedding water. It is optimized for sun protection and ventilation, so plan drainage and avoid using it as the sole cover in heavy rain or prolonged storms.

• Not waterproof—mesh allows water through
• Best used for UV protection and airflow, not rain shelter
• Remove or secure during storms for longevity
• Curved edges help rainwater flow rather than pool

Who is this for: The SUNLAX 16' x 20' sand rectangle shade sail is ideal for homeowners and outdoor hosts who need wide-area sun protection for patios, playgrounds, poolside lounging, or dining areas. It's a good choice for anyone seeking breathable UV shading with reinforced hardware and a design that resists sagging — perfect for seasonal installations where airflow and sun-blocking are priorities rather than complete rain protection.