Outsunny Square Outdoor Patio Sun Shade Sail Canopy, 16.5-Feet, Green Block 95% of harmful UV rays so you can enjoy the sun Effectively reduces heat and helps protect from harmful UV rays Constructed from woven high-quality and high-density polyethylene weave fabric cloth (185 gsm) Can be attached to your home, a tree, patio columns or a sun shade sail pipe 16.5' x 16.5' Square with four attachment D-rings