Shirts must have sleeves (both short and long sleeves are accepted), and goalkeepers must wear shirts which are easily distinguishable from all other players and the match officials. The Boston Celtics have won more NBA championships than any team with 17 championships. In 1885, the team becamse the New York Giants. Individual competitions may stipulate further restrictions, such as regulating the size of logos displayed on shirts and stating that, in the event of a match between teams with identical or similar colours, the away team must change to different coloured attire. The only other restriction on equipment defined is the requirement that a player must not use equipment or wear anything deemed dangerous to himself or another player.