Treasure Garden offers some high end patio furniture covers. They even supply us with their finest umbrellas. Thus, it only makes sense that they also supply us with their finest of high end umbrella covers.
For instance, this Treasure Garden Market Umbrella Cover is designed to fit any 11' or 13' Easy Track Umbrellas. It will keep the umbrella safe from the elements, and allow you to keep it outside during each and every season without a worry in the world. Well, except for aliens... It's definitely not tested against extra terrestrial forces. But, we'll ask them to get on that.