5 Year service - 185GSM High Density anti-aging Polyethylene fabric, washable, water-permeable, breathable, can be used up to 5 years; please feel free to contact us via amazon order details for replacement or anything else. Hardware Kit for Easy Installation - A set of hardware kit and 4 pcs ropes (1.5m long) are wrapped in the box, help to build and install your shade sail awning to porch, tree, pole, roof, stucco wall, brick wall and so on. Relatively quickly and easily. Make the shade sail to be sturdy enough to hold up to wind, rain. UV and Sunlight Block - Up to 98% UV and sunlight blocked, ensures a comfortable shading area in all seasons, especially summer. You can enjoy pleasant natural lighting without being roasted, sunburned or worrying about skin burns. Curved Edges and Double-Webbing - This sun shade is designed with curved edges to maximum tension; Every corner is sewn with 2 layers of nylon straps connected with durable stainless steel D ring, to avoid rip or break off. The size 20ft by 16ft means the straight distance of curved sides from D-ring to D-ring. The length and width of the middle area are shorter, it narrows towards the corners, make sure to leave 1. 5-2ft distance between D-ring and fixing points for hardware kits. Worry-free - We provide 24/7 customer services and 5 year service on this shade sail. If you need any replacement, or hardware kits, please feel free to contact us via amazon order derails. We will reply within 24 hours This is a BEAUTIFUL SUN SHADE for multiple uses and situations. It can be used as a sun shade over your patio, garden, above-ground pool, deck, yard, carport for any outdoor activities like wedding, party, commercial use, etc. Please note that the sail canopy only takes drizzle and breeze!!! Do not use in severe weather!!! More than 98% of UV Rays Blocked. Heavy Duty and Breathable Material with Stainless D rings. Portable, Very light and Easy to put up. Washable & Create Bigger Shadow Anywhere, Ideal for Cooling. Come with 4 Durable Ropes, 1 Flyer with Installation. Possible Sail Constructions Hyperbolic Style (Square/Rectangle Sails) For a Hyperbolic style effect, we recommend you construct your Square/Rectangle sail with diagonally two ends at a low point and the other two ends at higher points.