With the importance placed on masks in lucha libre, losing the mask to an opponent is seen as the ultimate insult, and can at times seriously hurt the career of the unmasked wrestler. Putting one's mask on the line against a hated opponent is a tradition in lucha libre as a means to settle a heated feud between two or more wrestlers. In these battles, called "luchas de apuestas" ("matches with wagers"), the wrestlers "wager" either their mask or their hair.