"He who rises to slay you, you shall slay him first". It is in the spirit of this old Hebrew proverb that the Israeli army developed "Krav Maga". Known as one of the most lethal and effective martial arts on earth, the official martial art of the IDF is 100% hardcore. Wear this Krav Maga hat sporting the words "Krav Maga" and the "Krav Maga" IDF symbol to show that you are not to be messed with! One size fits all.