Made of polyester. Waterproof and sunproof. edges are made slightly curved based on precisely calculated radian, helps shade sail to be tight and neat after installation, and prevents shade sail from sagging in the middle for best appearance and performance. Edges are finished with heavy-duty double layers reinforced stitched seams, prevent frayed edges and keep shade sail in shape, stainless eyes are attached to each corner for easy installation, corners are const
