A third jersey, alternate jersey, third kit or alternate uniform is a jersey or uniform that a sports team may wear in games instead of its home outfit or its away outfit, often when the colors of two competing teams' other uniforms are too similar to distinguish easily. Alternate jerseys are also a means for professional sports organizations to generate revenue, by sales to fans. Of North American sports leagues, the NFL generates $1.2 billion annually in jersey sales, with the NBA second selling $900 million annually. Another use of the alternate uniform is for identifying with causes, like the Central Coast Mariners wear an alternate pink kit on pink ribbon day.