It is difficult to describe the way a razor feels when it glides across the skin, but both the feeling and performance are classified by safety razor aggressiveness. There are several factors that affect how aggressive a safety razor is and how it performs. The size of the blade gap, the amount of blade that is exposed, and the cutting angle dictated by the design of the safety razor affect the way it shaves. This article simplifies cutting head designs to quantify safety razor aggressiveness.