| 摘要 |
A helmet for protecting the head of a wearer during sporting activities, comprising a protective shell, vents formed in the protective shell, and a shutter plate positioned within the protective shell. The shutter plate has apertures conforming in dimension and position to the vent openings so that that the apertures are in substantial alignment with the vents when the shutter plate is in a first position. The shutter plate is selectively moveable so that the vents are opened or closed.
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