In addition to outdoor soccer, the Challengers also play futbol de  salon, better known as "futsal." Futsal is FIFA's official indoor soccer game. Futsal is enjoyed around the world, but particularly in South America where it originated in the 1920s. It is played 5v5 on a hard surface court roughly the size of a basketball court, with no walls. Players wear flats, rather than cleats, and use a special low-bounce ball slightly smaller than a soccer ball. In addition to being extremely fun, the game emphasizes ball control, movement and precision passing. The Challengers, and many other McLean travel teams, compete during the winter months in the Washington Area Regional Futsal League (WARFL). WARFL is one of the largest youth futsal leagues in the country. WARFL also works with the Virginia and Maryland futsal organizations to sponsor futsal state cup championships in the two states. FIFA's US representative for futsal is the US Futsal Federation (USFF) which sponsors regional and national championship tournaments. The Challengers are the 2007 Virginia futsal state cup champions and won the WARFL tournament in both 2006 and 2007.