Square Sun Shade Sail Canopy Green 18'x18' Size is 18' x 18' Square, Green Color Provides 88% sun blockage of harmful UV rays. Brings down temperature approx. 20 degrees All corners include a stainless steel D-Ring and nylon chord for easy installation Knitted fabric material allows wind to flow through the fabric, making it ideal for high wind areas Material is 100% HDPE (High-Density Polyethylene), with no recylcled materials, resulting in long lasting durability