Why choose Kimdee sun shade sail? We are the producers of sun shade sail and stand behind our product. It has been thoroughly tested for many times. Many experiments shows that it protects effectively you from the harmful sun rays. Bring happiness in both outdoor and family activities. Order our Kimdee sun shade sail now and enjoy life forever. How to Measure 1. Shade sail's measurement should be taken from corner to corner 2. Approximate how much the area you want to shade. Locate 4 mounting points : they can be a roof, trees, poles, a tree, a pole, a wall, etc. 3. Take measurement of the 4 mounting points, leaveleaving 0.5 ft to 1 ft space for the hardware kits between the shade sail and the mounting points 4. Install the hardware kits on 4 mounting points Maintenance: Clean with mild detergent or water; do not scrub with a stiff brush; do not put it in your washing machine or clothes drier.