What is a primary tool used for layering hair?

A razor is a primary tool used for layering hair because it creates soft, blended edges as it removes weight from the hair. The unique cutting technique employed with a razor allows the stylist to achieve a more textured and feathered look, which is essential in layering. This method can effectively reduce bulk and enhance movement in the layers, giving the hair a more natural and free-flowing appearance.

Other tools, such as scissors, are typically used for more blunt cuts or structure, while a comb is primarily a styling aid for sectioning and managing the hair during haircutting. Hair clippers, on the other hand, are mainly utilized for very short styles or creating clean, sharp edges, which do not lend themselves to layering techniques in the same way that a razor does.