PREMIUM FABRIC: Made from 100% polyester fabric with PU coating (160 g/m), Resistant to water, tearing, and adverse weather conditions.The three sides feature a slightly curved cut for wind-resistant design; Size refers to stretched distance between D-rings, allowing 1-2 cm tolerance in manual measurement. Due to the curved design, the actual shade area covers 80%. EASY TO INSTALLATION: Our shade sails are easy to install. Simply measure and clean the installation area, leaving 1.5-2ft between the fixing point and shade sail to fit hardware, hooks, or ropes. The curved sides enhance pull strength and prevent drooping, which may cause the actual shading area to shrink slightly (tolerance of 4-6 inches on each side). You can install multiple shade sails of different colors and sizes for a larger shading area UV PROTECTION: Our shade sails can provide up to 98% UV protection and 90% shading rate, which can help reduce ambient air temperature and lower cooling costs and energy consumption. What's more, with the right design, you can save a lot of money. Choose our products for a safer, more comfortable outdoor experience that's also worry-free and cost-effective WATER RESISTANT: Our shade sails are water-resistant with a rating of 400mm HH, which means they can resist water to a certain extent but are not completely waterproof. They're also air-permeable, ensuring fresh air circulation for a comfortable outdoor experience. Installation is safe and easy with rope, and we suggest a 20-40 degree angle for maximum tension and rain runoff PRACTICAL & MULTIFUNCTIONAL: This shade sail is practical and multifunctional, making it suitable for use over patios, lawns, gardens, pools, ponds, decks, and more. It effectively reduces heat in outdoor living areas, making them comfortable even on the hottest days. You can install this shade sail in courtyards, backyards, parks, carports, pergolas, sandboxes, driveways, or any other outdoor area that requires shading