Riotsquad helmet
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A riotsquad helmet is a type of helmet designed for police and army use to protect its wearer from clubs and thrown objects, such as may be met in riot control.
There have been cases of riotsquad 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 padding inside and a chinstrap and a hinge-up (usually polycarbonate visor, as in this image. These riotsquad 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 riotsquad 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.
Other possible accessories include built-in radio microphone and earpieces.