section: Box lacrosse
question: explain box lacrosse
article: Lacrosse
candidates: Box lacrosse is played by teams of six on a hockey rink where the ice has been removed or covered by artificial turf, or in an indoor soccer or lacrosse field. The enclosed playing area is called a box, in contrast to the open playing field of the traditional game. This version of the game was introduced in the 1930s to promote business for hockey arenas, and within several years had nearly supplanted field lacrosse in Canada. Box lacrosse is played at the highest level by the "Senior A" divisions of the Canadian Lacrosse Association and the National Lacrosse League (NLL). The National Lacrosse League employs some minor rule changes from the Canadien Lacrosse Association (CLA) rules. Notably, the games are played during the winter. The NLL games consist of four fifteen-minute quarters compared with three periods of twenty minutes each (similar to ice hockey) in CLA games (multiple 15-minute OT periods for tied games, until whoever scores first). NLL players may use only sticks with hollow shafts, while CLA permits solid wooden sticks. :The goals in box lacrosse are much smaller than field lacrosse, traditionally wide by tall in box, and wide by tall in the NLL. Also, the goaltender wears much more protective padding, including a massive chest protector and armguard combination known as "uppers", large shin guards known as leg pads (both of which must follow strict measurement guidelines), and ice hockey-style masks or lacrosse helmets. Also, at the professional level, box lacrosse goaltenders often use traditional wooden sticks outside of the NLL, which does not allow wooden sticks. This makes Box Lacrosse faster and rougher than the traditional Field Lacrosse. The style of the game is quick, accelerated by the close confines of the floor and a shot clock. The shot clock requires the attacking team to take a shot on goal within 30 seconds of gaining possession of the ball. In addition, players must advance the ball from their own defensive end to the offensive side of the floor within 10 seconds. Box lacrosse is also a much more physical game. Since cross checking is legal in box lacrosse, players wear rib pads in addition to the shoulder and elbow pads that field lacrosse players wear. Box lacrosse players wear a different type of helmet as well, a hockey helmet with a box lacrosse cage. For most penalties, the offending player is sent to the penalty box and his team has to play without him (thus lacking one player) for a short amount of time. Most penalties last for two minutes, unless a five-minute major penalty has been assessed. What separates box lacrosse (and ice hockey) from other sports is that at the top levels of professional and junior lacrosse, a five-minute major penalty is given and the players are not ejected for participating in a fight.