Canopy fabric should be lightweight enough to transport easily yet sturdy to resist heavy rain and wind. It should be easy to clean and opaque to mask out most of the sun. You also can purchase a patio umbrella made with UV-resistant material. "Anything made of polyester, acrylic, or olefin are good outdoor choices," Young says. "Nylon, although it has superior strength and is known for its light weight, does not do well left out in the sun."