What does the term "porosity" refer to in hair?

The term "porosity" in hair refers specifically to the hair's ability to absorb moisture. This characteristic is crucial for understanding how well hair can retain moisture and other products, which impacts its overall health and appearance. High porosity hair has gaps and holes in the cuticle, allowing it to soak up moisture easily but also making it susceptible to damage and dryness. On the other hand, low porosity hair has a tightly sealed cuticle, making it more resistant to absorbing moisture but also more challenging to hydrate. Understanding porosity helps cosmetologists recommend appropriate treatments and products for different hair types, ensuring optimal care and styling.

While hair texture, length, and density are important attributes that influence the overall appearance and manageability of hair, they do not relate specifically to the capability of the hair to absorb and retain moisture, which is the essence of porosity.