Why do some helmets whistle?

[danwhite]

Just bought a new half face crash hat from Tescos in order to ride my scooter to Carrefour........ I get a wind-whistling sound in my ears over 55kph....... Why don't they test these things?.... Maybe it's a question of funny shaped ears and the helm

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[Muzz]

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[monsterman]

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[danwhite]

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[TonyBKK]

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[danwhite]

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[mikerust]

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[monsterman]

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[danwhite]

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