How did Liam Payne from one direction manage to make his curly?

Answer 1

He uses styling mouse and the defuser on the hair dryer.

^ this is quite true but his hair is naturally curly when it is long. He may have added the stuff above to keep it curly or add volume. He had his hair straight everday when he was in early stages of X-Factor because he would straighten it (with a pink straightner).....