Measurement: Measurement is taken from corner to corner, crafting slightly curved edges based on precise calculations. This design helps the Shade Sail to be tight and neat after installation, preventing any mid-sagging for optimal appearance and performance. Durable Mterial: Our Shade Sail is 100% crafted from 200 GSM HDPE (High-Density Polyethylene). Its woven knitted design is breathable, preventing water pooling and strong wind. Blocks up to 95% of harmful UV rays, our Shade Sails come with a 3-year warranty against UV degradation. Built to endure sun exposure, it resists UV and fading while providing a noticeable temperature reduction of up to 15 degrees compared to unshaded areas. ?Stainless D-Rings & Robust Edge: The edges feature robust double-layer stitching to prevent fraying and maintain the Shade Sail's form. Stainless steel D-Rings are affixed to each corner for effortless installation, while all corners are constructed with extra stitching to maximize the strength of D-rings. ?Insallation?: (1) Estimate your desired shaded area. (2) Choose from triangle, square, or rectangle shapes based on pole quantity. Attach using Hardware Kits to roofs, trees, or concrete walls. (3) For cable wire connection, maintain a 0.5 - 2 ft gap between D-Rings and poles.