usually sneakers or cleats, :)
45
NFL referees were never volunteers. However, many of them got their start in recreational leagues near their hometowns as volunteers.
Referees do not wear any numbered jerseys.
yes
Billy "White Shoes" Johnson, a famous return specialist for the houston oilers was the first NFL player to wear withe cleats.
They don't
They are assigned to each game
The referees in an NFL game have a very difficult job in calling the game they are assigned to. The highest paid among the referees is unknown.
41
In American sports, the referees usually wear black and white striped shirts. In the NBA, the officials wear grey shirts.
In the NFL, "flag" is usually used as slang for the yellow penalty markers which are thrown by the umpires, referees and side judges.