Goaltender (box lacrosse) long passes to teammates that are attempting to breakaway on unsuspecting defenders. Box lacrosse goaltenders are also encouraged to be aggressive stick checkers around the ball and ferocious cross-checkers when needed (cross-checking is legal in box lacrosse). If a goaltender leaves the crease with possession of the ball, opponents are allowed to cross-check the goaltender as long as there is no attempt to injure. Box lacrosse goalies play in front of a four by four foot net at most levels, unlike a field goalie who plays in front of a six by six net. At the National Lacrosse League, Major,
Field lacrosse member William George Beers codified the modern game. He established the Canadian Lacrosse Association and created the first written rules for the game, "Lacrosse: The National Game of Canada". The book specified field layout, lacrosse ball dimensions, lacrosse stick length, number of players, and number of goals required to determine the match winner. Field lacrosse involves two teams, each competing to shoot a lacrosse ball into the opposing team's goal. A lacrosse ball is made out of solid rubber, measuring 7.75 to 8 inches (19.7–20 cm) in circumference and weighing 5 to 5.25 ounces (140–149 g). Each team plays with