Formed in 1920 as the American Professional Football Association and known today as the National Football League, the NFL consists of 32 teams from US cities and regions. This league is divided into two conferences, the American Football Conference, and the National Football Conference. Each of these two conferences is further divided into four divisions. Each division consists of four teams and is categorized by East, West, North, and South regions. The NFL is one of the major professional sports leagues in the United States and is extremely popular with the highest game attendance in any professional sports leagues in the world. With this rising popularity, NFL merchandise, especially apparel, has become hot property. Football apparel from jerseys and warm-up gear to hats and t-shirts are available for each of the teams. Most sought after are NFL jerseys with specific player names and numbers. Available for men, women, and children, jerseys are usually worn at games, but fans can also be seen sporting their favorite team jersey as casual wear. With 32 teams and approximately 1,800 players in the NFL, there is a widespread choice in jerseys. 'Throwbacks', vintage replicas of original jerseys, from leading sporting goods manufacturer Mitchell & Ness are also extremely popular. This company reproduces authentic jerseys worn by the stars of yesteryear with close attention to detail. Mitchell & Ness, among others, are known for their vast collection in NFL apparel which includes jackets, hats, shirts, shorts, and much more. Nike and Reebok are also famous for sponsoring and producing NFL apparel and equipment.