<b>Tuosite Waterproof Shade Sail</b> </br> </br> Tuosite Tent Replacement is the most cost effective shade solution per square foot. </br> Sail Shades are wonderfully versatile; they can be attached to homes, fences, trees, or patio columns. In addition, they can be supported by wood posts or steel columns embedded in concrete footings. They can easily be taken down seasonally if necessary. Shade Sails are the ultimate in stylish sun protection. You can creatively design your own little shady area in a courtyard, pool, gardens, children's play areas, car spaces, and even entry ways. </br> </br> </br> <b>HOW TO MAKE THE MEASUREMENT</b> </br> </br> 1. Measure the distance from one post to the next post. </br> 2. Based upon those measurements, subtract 1-1.5 feet. For example, for a 11' by 11' by 11' measurement we suggest one 10' by 10' by 10' product. </br> *Our sun shade sails have curves on each side to enhance pull strength and prevent drooping on the sides. </br> *Due to curves, please keep in mind that our sun shade sails will be 4-6 inches shorter in middle width. </br> Note: No "waterproof" sun shade from any manufacturer is 90% waterproof, then it would be a plastic tarp.