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Weight is a major concern of mine given my son is only 8. I suspect the bell moto 9 flex is a couple hundred grams lighter.

Yeah so thats why im trying to understand when people say they are the first or second best helmet on the market is that based on 2014 when they were released and not comparing the helmets of today. I dont have any preference, i just want to make sure if the Arai is a better helmet that i know that...

Thanks, i did try both on my son he as you mentioned both fit really well. If anything the Arai fit slightly better but its very marginal. Regarding those plastic vents yes they are designed to break away but still the initial impact could hit them and then the whole round shape becomes void.. I imagine they still are going...