Why do muay thai fighters wear that rope around their arms?

I%26#039;ve heard that traditional, real muay thai fighters in Thailand grow out their hair because they aren%26#039;t suppose to cut it until they lose a fight, so what%26#039;s with the rope that they tie around their arm when they fight? What%26#039;s the tradition, history, or reason behind that?|||Those armbands are part of Muay Thai tradition. They are called the Pra Jiad and fighters wear them for self confidence and good luck in their matches. They don%26#039;t necessarily have to be made out of rope but also from some other materials that hold special meaning for fighters.|||like gloves.. and tradition.. pluse rug burns :D