【MEASUREMENT 】: Measurement is taken from D ring to D ring, leave 1 - 1.5 foot space for the hardware kit between shade sail D ring and mounting points, all edges are finished slightly curved so it can be stretched tightly, prevent middle from sagging, shade sails come with 5 years full warranty, under normal weather and usage. 【VIRGIN, UV STABLIZED COMPOUND & THICK MATERIAL】: The only sun shade sail on the market that are made of 160 GSM 100% virgin (Non-recycled) HDPE material. Our virgin HDPE fabric went through 20000 hours of labouratory UV testing and it is proved to be 70% more durable compared to recycled HDPE under sun exposure, fabric has been treated with UV stabilized compound, preventing shade sails from dried out, tearing and fading, significantly extend the lifespan. 【95% UV BLOCKAGE & BREATHABLE WOVEN FABRIC】: Blocks 95% of harmful UV, significantly reduce the temperature and UV sunlight in shaded area during summer time, ideal for patio, swimming pool, balcony, carport etc. Breathable fabric allows water and air to go through freely, no pooling water in rainy days, resistant to both UV and water, no maintenance needed. 【STRUCTURE DESIGNED FOR DURABILITY】: All edges are constructed with heavy duty double layered reinforced stitched seams, prevents frayed edges and out of shape. Each corner ends with stainless steel D-ring for easy hanging, extra heavy stitching to help the D-rings strongly attached to the shade sail. 【INSTALLATION GUIDE】: Installation hardware kits are required and sold separately, each D-ring will require one cable rope (DO NOT use nylon ropes, they break easily!!). Connect the other ends of cables to existing poles, trees or wall with shade sail hardware kits, high quality ColourTree hardware kits and cables are strongly recommended for best performance and appearance.