Hockey helmet
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A hockey helmet is worn by ice hockey players to protect the head from potential injury.
Hockey helmets comfortably grip the head from inside by cupping the back of head, or the occidental protuberance. Helmet manufacturers will have a chart that corresponds their helmet sizes to head measurements. To find the proper size for you, measure the circumference of your head about 2.5cm or 1 inch above your eyebrows.
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. A hockey helmet should fit snug to prevent any shifting and maximize protection. There should be no rotation of the helmet and nor should it be so loose that the shell slides down covering the player's field of vision.
The shell of a hockey helmet is made of a substance called vinyl nitrile that disperses force and absorbs the impact of hits by pucks, sticks, skates or contact with the ice, to reduce the chances of concussion. Never paint or add stickers to the shell of the helmet as this weakens the structure and may invalidate any certification.
It may also be worn with a visor, which in some leagues (particularly for younger players) are mandatory.
References
BeerLeagueHockey.com Proper Fit For A Hockey Helmet (http://www.beerleaguehockey.com/content/view/102/46/)Reviewed May 26, 2004 Template:Icehockey-stub