The Thai League 1 (Thai: ไทยลีก 1), often referred to as T1, is the top level of the Thai football league system. Contested by 16 clubs, it operates on a system of promotion and relegation with Thai League 2. Seasons run from February to October, with each team playing 30 games (playing all 15 other teams both home and away). 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.