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In page Goalkeeper:
"The new cap rules resulted in a goalie cap must now be in quarters alternating red/dark for home and red/white for away, the goalie must be number 1, 13, or 15, and for females: a red swim cap must be worn under the goalie cap, a team's dark swim cap is no longer acceptable as it is hard to distinguish a goalie from field players if the official cap is off. USWP and NCAA rules vary slightly.[citation needed]