Question: What Items are required in water polo?
About the article "Water polo", section "Water polo equipment".

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Inner tube water polo is a style of water polo in which players, excluding the goalkeeper, are required to float in inner tubes.
By floating in an inner tube players expend less energy than traditional water polo players, not having to tread water.
This allows casual players to enjoy water polo without undertaking the intense conditioning required for conventional water polo.
Surf polo, another variation of water polo, is played on surfboards.
First played on the beaches of Waikiki in Hawaii in the 1930s and 1940s, it is credited to Louis Kahanamoku, Duke Kahanamoku's brother.
Canoe polo or kayak polo is one of the eight disciplines of canoeing pursued in the UK, known simply as "polo" by its aficionados.
Polo combines paddling and ball handling skills with a contact team game, where tactics and positional play are as important as the speed and fitness of the individual athletes. 
 equipment.
Little player equipment is needed to play water polo.
Items required in water polo include:
Ball: A water polo ball is constructed of waterproof material to allow it to float on the water.
The cover is textured to give players additional grip.
The size of the ball is different for men's, women's and junior games.
Caps: A water polo cap is used to protect the players' heads and ears, and to make them identifiable from afar.
Home team field players wear numbered white caps; Visiting team field players wear numbered dark-colored or black caps.
Both starting goalkeepers wear red caps (sometimes quartered), numbered "1" (substitute goalies' caps are numbered either "13" for FINA international play or "15" for NCAA play) Caps are fitted with ear protectors.
Goals: Two goals are needed in order to play water polo.
These can either be put on the side of the pool, or in the pool using floaters.
Mouthguard: A mouthguard is not mandatory in most tournaments, but is recommended.
Swimwear: Male water polo players wear either swim briefs or jammers (thigh-length trunks).
Female players must wear a one-piece swimsuit.
Suit-grabbing fouls are common, so players often wear tight-fitting suits, and may layer on several suits at a time for additional security.
Many swimwear labels also sell specialized water polo suits that feature reinforced stitching and tougher fabric.
Female water polo suits are generally one-piece outfits which do not have open backs, but zip securely up the back so as to not have straps that can be easily grabbed.
There are many ground root Water Polo teams in existence across the Greater Birmingham area such as Warley Wasps who were established in 1888, the team runs both male and female water polo teams.
Also ""Sutton Coldfield Water Polo Club"" and ""Solihull Water Polo Club"" offers water polo training for children and Adults with qualified Water Polo coaches.
The City of Birmingham Swimming Club draws from the local water polo clubs and competes at a national level. 
  FINA Water Polo Rules 2009-2013  National Water Polo League  Water Polo Planet  
Inner tube water polo (ITWP) is a variation of the sport water polo with the important difference that players, excluding the goalkeeper, are required to float in inflatable inner tubes.
By floating in an inner tube, players experience less contact and expend less energy than traditional water polo players, not having to tread water.
This allows casual players to enjoy water polo without undertaking the intense conditioning required for conventional water polo.
This sport is predominantly played at universities by intramural coed teams, but can also be found in recreational adult leagues.
The sport's rules resemble those of water polo, however, with no governing body the rules vary across different leagues.
For example, while the winner is determined by the team which scores the most goals, some leagues award one point for a male goal, and two points for a female goal, while others award one for either.