It was traditionally worn by Vietnamese women for the protection from the sun when they are working in the rice fields. It has a conical shape and is kept on the head by a cloth (often silk) chin strap; an internal bamboo frame keeps the hat itself resting on the head. Its frame is tiled with dried bamboo husks so it can also protect you from rains. Nowadays, conical hats are elaborately designed to be worn in formal occasions. In the area of Hue city, the local people are noted for their “Poem Hats”. They compose a poem on a sheet of paper then put it between layers of bamboo husks so you can see the poem on sunny days. Ao Dai and Non La have become the symbol for the Grace of Vietnamese Ladies.