Using a lint brush or the adhesive side of tape will remove dust and dirt on wool hats. If your wool hat gets out of shape, you can use steam from a tea kettle to reshape it. Hold the hat in the steam and allow it to soften. You can then reshape your hat to its original shape and then let it cool down before wearing. Always place a hat upside down on its crown if you do not have a hat rack for storage.
I picked this hat up on clearance sale at my local hiking and camping shop, so it was kind of an impulse purchase. It handles being stuffed in your bag, it sheds rain pretty well, it returns to the same basic shape (but it's a "floppy" hat, so it doesn't matter too much what shape it takes), it's good in a wide range of temperatures, and the inner band is really comfortable. I have to admit, the thing that made me buy it was the Billy Jack hat band, and that's not too overstated or cartoonish. Surprisingly for a wide brimmed hat, it looks just as good with shorts, sandals, and a T-shirt as it does with pants, boots, and a jacket.
Well made, good stuff!