I'm new to the world of hats so let me share what little I know. I have two Indiana style hats. One is the soft crushable which is much more comfortable but looks more casual as well. This one is hard. Someone said it has a plastic form, I'm not sure what it's made of but it seems harder than my head. Sizing is crucial. Most size charts are the same but the one at [...] is what I used. I'm right between large and medium so I ordered the medium and it's a bit snug. I don't think it will stretch, but it may.

If you want comfort get the Scala Felt hat which is similar but more casual and a bit cowboy-ish. If you want style get this one.

Update
 First, the hat does indeed stretch a little. It's still stiff but seems to be in the process of molding itself to my head. This will take several hours of wearing however

 Second, Amazon filtered out the sizing link. Do a search for hat sizing and you should find some charts that compare head diameter, classic size, and standard sizing. Order your size according to it unless you are near the fringe and in that case go up a size as these are snug, but meant to be so.