I think they're basically the same helmet - the "2" is the newer version of the "F". The "2" has a fully removable/washable liner, the "F" did not. Slightly better ventilation, and slightly lighter weight on the "2", that's about it.
I had an F and I liked it just fine, though the removable liner would have been really nice. I stepped up to a Corsair and love it.
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