ShelterLogic 25722 12'x12' Square Sand Sun Shade Sail Advanced engineered fabric blocks 90 percentage of harmful UVA and UVB rays yet is remarkably breathable allowing air to circulate Specially designed woven polyethylene allows rain to pass through; water will not collect or pool Reinforced stitched corners with all steel fittings attach quick and easy to mounting points Advanced engineered fabric blocks 90 percenatage of harmful UVA and UVB rays yet is remarkably breathable allowing air to circulate Shipped ready for installation with a basic install hardware kit; Use more than one shade sail to create your own unique outdoor shade and living space