Coolaroo Party Sails feature Coolaroo's unique commercial grade knitted fabric specially designed to breathe, keeping outdoor areas temporarily shade free and cooler. This state of the art material blocks up to 90% of the suns harmful rays yet remains totally unaffected by moisture and natural temperature extremes. And because Coolaroo fabric is knitted, not woven, it won't tear or fray. Shade is mildew-resistant to protect the shade. Party sails are ideal for children's play areas, for use when camping, boating, and more. Three nylon cords make for quick corner tie up. Three year warranty on fabric.