Longer hair for men has become mainstream and with it came the man bun. What is a man bun? br Well, it’s a cool alternative to the ponytail for pulling long hair up and back. br A bun it a twist or loop of hair. It can be worn high on the head, low towards the neck or somewhere in between. There isn’t just one man bun but a range of ways to style the look. For something different, add an undercut, low fade or shaved sides.