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Icon is no longer going for Snell certification, just DOT and ECE in the US. As a result, my local dealer isn't stocking them any more, haven't decided what I'm going to run for a helmet next year yet.
My 2008 Snell sporting Airframe is ok, it's light, fits decently, has ok airflow, etc. It gets inspected more thoroughly at LRRS tech I've noticed. Sharp doesn't have any test data on them so I can't give a hard numbers based comparison on how well they protect vs other brands.
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It's a plastic shell so it's not LRRS legal. I dunno if any of the TD orgs hold to that rule or not.