The Thai League 1 (Thai: ไทยลีก 1), commonly known as the T1, is a Thai professional league for Football Association of Thailand clubs. At the top of the Thai football league system, it is the country's premier football competition. Contested by 16 clubs, it operates on a system of promotion and relegation with Thai League 2. The Thai League is a corporation in which the 16 member clubs act as shareholders. Seasons run from February to October, with teams playing 30 games each with a total of 240 games in the season. It is sponsored by Toyota and therefore officially known as the Toyota Thai League. In the Thai League, most of the games are played during Saturdays and Sundays, with a few games played on Wednesdays and Fridays.