In rugby union, the fullback usually wears the number 15 shirt. The position of fullback is an important defensive role, requiring the player to be skilled in catching, kicking, and running with the ball. The number 15 shirt is traditionally reserved for the fullback, although in some teams, other positions may also wear this number. The fullback is typically positioned at the back of the field, ready to retrieve and return opposition kicks, and to provide support to the team’s attack should the opportunity arise.