What does the thickness or diameter of each hair strand refer to?

The thickness or diameter of each hair strand is referred to as texture. In the context of hair, texture describes the individual characteristics of the hair strands themselves, which includes how coarse or fine they are. When we talk about texture, we're looking specifically at the physical attributes of the hair, such as its diameter, which can affect how the hair behaves, styles, and reacts to products.

Coarseness refers to a specific type of texture indicating that the hair strands are thick and robust, but texture itself encompasses a broader range, including fine, medium, and coarse hair. Volume relates to the amount of hair present and how much it lifts away from the scalp, while density refers to the number of hair strands in a given area of the scalp. Understanding these distinctions is crucial for hair professionals when assessing and recommending treatments or styles to clients.