Seattle Sounders FC is a professional soccer club based in Seattle, Washington, USA. The team was founded in 2007 and has quickly become one of the most successful teams in Major League Soccer (MLS).... The Seattle Sounders have worn various kits throughout their history, but their traditional home kit is a green jersey with blue sleeves, accompanied by blue shorts and green socks. This color scheme is a nod to the team's Pacific Northwest roots and is reminiscent of the green and blue hues found in the natural surroundings of Seattle. The team's away kit has varied over the years.