Periodically, felt hats can become misshapen. In order to get your felt
hat back up to snuff, you can use the wonderful power of steam!
on your tea kettle and create some steam. Don't soak the brim with this
steam, but rather carefully expose the turned up brim to the steam. It
should soften somewhat. Then train your brim to the result that you are
looking for. Go back and forth between steaming and training. The hat
should eventually "remember" the way it was originally blocked.