Both have little airflow, can't say which one have the smallest but don't get a new exo 1000 if you want more airflow than the 500. Get a 750 or another brand sports helmet.
In summer I ride them both (500 and 1000) with the visor slightly opened and then I can breath. I do the same at winter with the 1000 but next winter I'll steal the pinlock visor from my GF's helmet!
I own a 2009 exo 1000 but it has a 2011 chin air inlet scorpion gave me for free (mounting included) since a HUGE bug broke my air inlet!
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