Riot protection helmet
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A riot protection helmet is a type of helmet designed for law enforcement and military use to protect its wearer's head, face and eyes from handheld melee weapons, and thrown projectiles such as bricks, as may be met in riot control. Many modern riot squad helmets are reinforced with materials that will protect the wearer from dangerous substances such as acids or industrial chemicals.
There have been rare cases of riot protection helmets being worn to protect against objects blown by storm wind, for example in England in the 18 January 2007 gale.
The simplest form is a hard shell with reinforced padding, and a chinstrap and a hinge-up (usually polycarbonate) visor, as in this image. These riot protection helmet visors are usually curved sideways and straight up-and-down, not curved both ways like on the older type of motorcycle helmet. One accessory is a back-of-the-neck protector.
An example of a more complicated riot squad helmet is a French CRS helmet which has two visors: the outer visor is clear and hinges up outside the helmet; the inner visor hinges up between two layers of the helmet and has a finish which can be seen through from inside but from outside looks like opaque polished brass.
British cash-in-transit officers can also be seen wearing these helmets along with a stab proof vest to prevent serious injury if under attack.