What does the term "hair porosity" refer to?

Hair porosity refers to the hair’s ability to absorb and retain moisture, which is crucial for maintaining healthy hair. It describes how well the hair’s cuticle, the outer layer, can allow moisture and other substances to enter and exit. Hair porosity can be categorized as low, medium, or high.

Low porosity hair has tightly packed cuticles that are resistant to moisture, making it difficult for products to penetrate. Medium porosity hair has a balanced structure that allows for moisture retention while also permitting some product absorption. High porosity hair has gaps and holes in the cuticle, causing it to absorb moisture easily but also lose it just as quickly, often leading to dryness and damage.

Understanding a client’s hair porosity is vital for choosing the right products and treatments tailored to their specific hair needs, helping to enhance moisture retention and overall health. The other options relate to different attributes of hair that do not pertain to moisture absorption or retention capabilities.