In fact many of the best haircuts for guys start with an undercut or fade on the sides and back and medium length to long hair on top. The longer the hair is the more experiments you can make with it and the more different hairstyles you can come up with.
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Slicked Back Short Mens Hairstyles https://www.youtube.com/watch?v=KlwxDVu6zws
50 Stylish Undercut Hairstyle Variations To Copy In 2019 A https://haircutinspiration.com/undercut-hairstyle-for-men/