Perfect shade for my pool.  Rectangle shade sail attached Using cable wires to connect shade sail to poles.  Comes with adjustable turnbuckles to tighten & create tension. Edges are finished with heavy-duty double-layered reinforced stitched seams, prevents frayed edges and keep shade sail in shape, stainless D rings are attached to each corner for easy installation, corners are constructed with an extra amount of stitched seams to maximize the strength of D rings.
Edges are made slightly curved based on precisely calculated radian to help the shade sail stay tight and neat after installation and to prevent the shade sail from sagging in the middle. Keeps my swimming pool water warm in the sun and cool on the area protected by shade sail.