World Series Boxing - Los Angeles Matadors vs. Moscow Dynamo, Hollywood, CA on December 4, 2011. Both amateur boxers compete without vests or head guards.
The World Series of Boxing or WSB is a professional international boxing competition that allows the professional boxers to maintain Olympic eligibility, organised by AIBA. Unlike amateur boxing, competitors taking part in sanctioned World Series of Boxing bouts must be bare-chested and are not permitted to wear protective headgear. Each participating boxer is drafted by one of a number of international franchises and can earn money by taking part in professional-style bouts. However, they maintain amateur status and remain eligible to compete at the Olympic Games. Like professional boxing, each bout is decided by the scores of three judges or, in some cases, by a knockout, technical knockout or walk-over. A WSB meet between two international franchises consists of bouts in ten (formerly five) weight categories. There are five three-minute rounds in each bout and the team that wins the most number of bouts wins the meet.
Until season 4, there were five weight categories which were different than 10 categories in amateur (Olympic) boxing or 17 categories in professional boxing. These were Heavyweight (91+ kg), Light heavyweight (80–85 kg), Middleweight (68–73 kg), Lightweight (57–61 kg) and Bantamweight (50–54 kg). In the fourth season (2013/2014), the number of weight classes was increased to ten, and they are same as in amateur (Olympic) boxing.