 Sweaters have a loop of fabric sewn into the inside back, called a "fight strap" or "tie-down", which must be secured to the player's pants during a game, to prevent the sweater from being pulled over the player's head in a fight.Players normally get a new jersey every ten or so games, although due to other reasons players may get another jersey sooner.In recent years, teams have sold both "pro" model sweaters, ostensibly identical to those worn by players, and "replica" quality sweaters which are cheaper versions that typically use cheaper production methods and lower-quality materials.