Few people know the history of the emergence of pom-pom on the hat. However, it was invented for a reason, and in order to protect the head of French sailors. All the matter is that before when ships were building, few people cared of comfort, and the ceilings were very low inside of the ship. And pompom defended the sailors head from a hitting the ceiling. It's been a long time ago, but even now, when ceilings are much higher, the red pompoms still adorn hats French sailors.