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Hockey helmet : ウィキペディア英語版 | Hockey helmet
A hockey helmet is worn by players of ice hockey and inline hockey to help protect the head from potential injury when hit by the puck, sticks, skates, boards, other players, or the ice. ==Construction== Hockey helmets grip the head from inside by cupping the back of head, or the occipital protuberance. Helmet manufacturers will have a chart that relates their helmet sizes to head measurements. Most helmets have tool-free adjustments, but on older models, the helmet size is adjusted by loosening the screws on the side to slide the front portion forward or back. The shell of a hockey helmet is generally made of a substance called vinyl nitrile that disperses force from the point of contact, while the liner may be made of either vinyl nitrile foam, expanded polypropylene foam, or other material to absorb the energy, to reduce the chances of concussion.
抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)』 ■ウィキペディアで「Hockey helmet」の詳細全文を読む
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