Water polo cap
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A Water polo cap is a piece of headgear used in water polo. The caps are used to protect the ears from injury possibly caused by a water polo ball hitting the ears at high speed. They are also used to identify the player, using the number on the cap.
[edit] Different caps
Not all players in the pool wear the same caps. Besides the obvious difference in the number on the cap, also the color may change depending on the team.
Players from the visiting team will wear dark colored caps, whereas the home team players will wear white caps. The goalkeepers wear quartered red caps, numbered "1", while substitute goalies have caps which are either numbered "1-A" in NCAA games, or "13" in FINA international games.