Knead it into a ball with newspaper. Then adjust the adjusting button of the hat to the size of the hat you usually wear, and then put the spherical newspaper in the hat. Leave it for more than 24 hours. Use a plastic bottle that can hold boiling water. Turn the hat upside down, preferably hanging. Put the plastic bottle in and let it stand 10 minute.

The types of hats are:

1. According to the use: snow hat, rain hat, sun hat, safety helmet, dust hat, nightcap, working hat, tourist hat, top hat, etc.

2. According to users and styles: men's hats, women's hats, children's hats, minority hats, lovers' hats, cowboy hats, sailor hats, military hats, police hats, professional hats, etc.

3. According to the production materials: fur hat, felt hat, wool hat, long hair hat, velvet hat, straw hat, bamboo hat, etc.

4. According to style features: beret, cap, bell cap, triangular pointed cap, forward cap, youth cap, shawl cap, bonnet, Longjiang cap, Beijing cap, Shanxi cap, cotton ear cap, octagonal cap, melon cap, tiger head cap, etc.