Your 9- to 11-foot market umbrella will have a much longer life when you protect it from the elements with this Two Dogs Designs Market Umbrella Cover. This is the best cover you can buy, and it's constructed of 600-denier polyester, the same material used on luggage. It's weatherproof and waterproof to lock out any elements that would damage your umbrella. Additionally, a PVC liner offers extra protection. A zipper closure makes getting it on and off easy, and a strong poly cord ensures a tight closure at the bottom.