This featured as a staple for a Riddler cosplay for Glasgow Comic Con this year - with one or two home-made adaptations - and did its part excellently.
It's a cheap costume hat, not an actual bowler hat; that's probably why it's listed as a 'toy' in the first place. The plastic is very thin - my friend dropped it on the way home, splitting the plastic in two in the process. But, like I said, it played its role perfectly all weekend.
The size was just perfect for my head, and I don't have a freakishly small cranium or anything.
After the break, I won't be able to use it again, but I wouldn't need to anyway. This is a one off costume piece. That's all.