Only Coolaroo Shade Sails feature Coolaroo's unique Commercial Grade knitted fabric specially designed to breathe. This state of the art material block's up to 90% of the suns harmful UV rays yet remains totally unaffected by moisture and natural temperature extremes. The Sails are colorfast, remaining vivid year after year. Because Coolaroo's unique fabric is knitted, not woven, it won't tear or fray, allowing shade sails to be tensioned over patios, courtyards, or playgrounds. Coolaroo fabrics have a 10 year manufacturer's warranty against UV breakdown. Made of High Density Polyethylene Fabric w/ 90% UV Block. Now comes with hardware kit included!