Quote:
Always reflect on the size of your head.
If a round face fat head (like me)--go Bell (G-Force or Pyrotect also).
If a skinny face, thin head, go Simpson, Impact, Arai.
You still have to find the right size--try them on; but for generalizations to get to the correct manufacturer, the simple test outlined above works well.
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I definitely fall into the skinny face, thin head category and my Bell M2 Pro fits nicely. I hadn't heard the Simpson/Bell head thing before so I didn't know any better. I actually ordered mine over the Internet and the first one was a tad loose so I went one size smaller and it fits like a glove. Don't compromise on fit no matter what.