Outsunny  Square Outdoor Patio Sun Shade Sail Canopy,  16.5-Feet,  Sand Block 95-percent 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