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In page Goalkeeper:

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The only mandatory equipment for goalkeepers are masks, goalie-shirts, goalie-pants and shoes. Most goalkeepers also wear gloves. They may also optionally wear other protective equipment, such as knee pads, elbow-guards, shin-guards, jocks and torso armor. In some junior/independent leagues, many goalkeepers don't even wear goalie-shirts, but hooded tops[citation needed].