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As Ben Goldacre explained in an editorial on bike helmets in the British Medical Journal , we are dealing with confounding variables that are generally unmeasured and perhaps even unmeasurable. What we are left with is a paradox

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Note, besides the QVR Duct, youll also need the QVR slider mechanism found on the other Arai helmets, as it has an interface that the QVR Vent locates into

But the Grid isn't made from particularly technical materials, so it's only water resistant and not the most hardy