Shade&Beyond 13' x 19'8" Rectangle Sand Color Sun Shade Sail, UV Block for Outdoor Facility and Activities Eco-friendly 185gsm high-density polyethylene knitted cloth, permeable to air and water, no pooling bother High quality 304# stainless steel D ring on each corner, easy to install and take down 5-year warranty against UV degradation, block up to 98% UV rays Inward curved sides for better tension and artistic appearance Industry leading resistance to mold growth and corrosion, easy to maintain