A men's short hair perm is a hairstyle where a chemical solution is applied to the hair causing it to change structure, resulting in curled or wavy hair. Leonardo DiCaprio's messy bob in the 1997 film "Titanic" is a vivid demonstration of this hairstyle.
This style is lauded for its ability to enhance volume, texture, and style versatility. In the 1980s, the men's perm gained immense popularity as part of the "new romantic" fashion trend.