Vietnam is hot and sunny for much of the year, and the rainy season brings sudden heavy showers. A non la solves both problems at once. The wide brim shades the whole face and shoulders from the sun, like a portable parasol. When the rain comes, the leaves shed water like a tiny roof.
Each hat is made by hand. The maker cuts young palm leaves, dries them flat in the sun, and irons them until they are smooth. Then they stretch the leaves carefully over a bamboo frame in the shape of a cone and stitch them in place with very fine thread. A really good hat can take a whole day to make.
The non la has been around for hundreds of years. In some villages, the same family has been making them for many generations - mothers and grandmothers teaching daughters how to stitch the leaves. Some hats are decorated with poems painted between the layers, only visible when you hold them up to the light.
You'll see non la hats everywhere in Vietnam - in rice fields, on bicycles, at busy city markets, on schoolchildren walking home. They are light enough to wear all day and can be used as a basket, a fan or even a tiny picnic plate when needed.