Nike is one of the most well-known and successful sportswear companies in the world, and it has several rivals. These include PUMA, with four letters; Asics, with five letters; Fila, with four letters; Reebok, with six letters; ADIDAS, with six letters; Avia, with four letters; Keds, with four letters; and CONVERSE, with eight letters. All of these companies produce a variety of sportswear and footwear, competing with Nike for customers.