It covers an 11 foot umbrella well. The cover's wire insert allows one to reach over the top of this size umbrella without the need to get onto a chair. The wire assembly could have been more easily devised but is not difficult. If you have a larger (5 foot) diameter table, reaching the zipper to close the cover afterwards can be a bit of a challenge. Likewise, if the zipper is not opened enough, a greater stretch is needed to remove cover over the top of an 11 foot umbrella with a larger table. An optional wire extension on the zipper would be recommended. 

Pros: Good idea to protect umbrella when not in use.
Cons: Zipper also needs an extension to aid with removal and application of cover.