What is a key characteristic of a "crew cut"?

A crew cut is defined by its short length, particularly on the back and sides of the head. This style involves cutting the hair very short on the sides and back, creating a clean and uniform look. The top section is typically left slightly longer but is still significantly shorter than styles that feature longer hair. The overall appearance is neat and low-maintenance, which is ideal for many individuals seeking a straightforward grooming option. The crew cut is popular in various settings, including professional and casual environments, due to its versatile and tidy look.

The other options suggest characteristics that do not accurately define a crew cut. Hair left long on top, heavy use of styling products, or significant layering are not typical features of this hairstyle, which is primarily focused on simplicity and shortness.