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PhilDAS-
I heard that with a similar helmet from a different brand the chin piece could detach in a crash and would then slice open a cheek...
Even in motorcycle helmets the convertible helmets have a serious risk of opening in a crash, so I'd be hesitant to trust the lightweight version of that. (The speeds might be lower, but at the same time there's far more things for the helmet to snag on.)
Tijmen
Doesn't that defeat the object, if it lacks all the extra head/neck protection?