Idrottsföreningen Elfsborg, more commonly known as IF Elfsborg or simply Elfsborg is a professional football club based in Borås, Sweden, and is affiliated to the Västergötlands Fotbollförbund. They play in the Allsvenskan and have spent most of their history in the top tier of Swedish football. Their homeground is Borås Arena, where they have played since 17 April 2005. The club was founded in 1904.Ever since Elfsborg was established they wore the main color yellow with some strikes of black.