Polyester umbrellas feature canopy covers in a variety of colors in fabric weights ranging from 6 oz. polyester canvas to 8 oz. polyester canvas. Polyester canvas is typically treated with 3M Scotchgard to keep the fabric stain resistant for many years. Polyester canopy fabric is a more durable and a longer lasting choice for your patio umbrella than plastic, cotton or vinyl. It can also be lighter in weight than the solution-dyed acrylic fabrics such as Olefin and Sunbrella brand fabrics. The polyester used for patio umbrellas is waterproof and provides UV sun protection.