Our shade sails made of 100% brand new high-density permeable 160GSM polyethylene knitted fabric material.have curved sides to enhance pull strength and prevent drooping; this can add 1-8 in side. length. Middle-center of sail will be shorter in width due to curves. If straight sides are preferred please contact us. Read for details Ideal Shade Solutions - for your deck in backyard, pool and pond, pergola, sandbox, driveway or other outdoor area to protect against up to 95% harmful UV rays, and make your patio privacy safe, cool and fabulous. Curved sides to enhance pull strength and prevent drooping, so the actual shading area would shrink slightly, tolerance 4~6 inches for each side. You could install different shade sails of different colors and sizes to get a larger shading area. Please measure the size of the installation area accurately before purchasing. Leave 1.5-2 foot space for the hardware kit between D ring and fixing points, all edges are finished slightly curved so it can be stretched tightly. Stainless steel D ring on each edge and 3*4.9FT long durable ropes are strongly guarantee fastness of installation.