What is a common technique barbers use to blend hair lengths?

The technique used by barbers to blend hair lengths effectively is clipper over comb. This method involves using a clipper while holding the comb in a specific position against the scalp, allowing the barber to control the length of hair being cut. By adjusting the angle of the comb and the clipper, a smooth transition can be achieved between different hair lengths, facilitating a seamless blend that looks natural.

Clipper over comb is particularly favored for its versatility and precision, making it ideal for creating fades or taper cuts. It's a practical skill that barbers master to ensure a professional finish. Other techniques, like sectioning the hair, can help organize the cutting process but do not directly contribute to blending in the same effective manner as clipper over comb. Using a straight razor is more about detailing and texture rather than blending. Shaping with scissors is another valid cutting method, but it typically does not achieve the same immediate transition between lengths that clipper over comb can provide.