| 摘要 |
A protective helmet is composed of an external crown made from plastic material, and a semi-rigid neckband adjustable by adjustment means. To ensure that the helmet is efficiently secured on the user's head regardless of his or her hair-style, the neckband is in the shape of an Omega composed of lateral securing zones and a curved central part for free passage of the user's hair worn in a pony tail. The ends of the lateral securing zones of the neckband are joined to the adjustment means.
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