It's like Lirange says, you can buy hats as skins, they've become wildly popular for some reason. You can have all sorts of wacky hats from simple baseball caps to the weird drink hats, cowboy hats...
Imagine how ridiculous they would look on one of those DoTA heroes. Still, popular stuff is popular.
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Credits to Loveless for the great signature!
We rode on the winds of the rising storm
We ran to the sounds of thunder
We danced among the lightning bolts
And tore the world asunder
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