Some Manly Haircuts include the Flattop, which is a classic men's haircut that has been around since the 1950s. It is characterized by short sides and a flat top, usually with a straight line across the forehead. The hair on the top of the head is cut to a uniform length, usually about one inch, and then combed up and back. This style is often seen in military personnel and is popular among men who want a classic, clean-cut look.