How would a stylist describe hair that is highly porous?

Hair that is highly porous has a structure that allows moisture and other substances to pass through easily, which often leads to a very dry and brittle feel. This porosity occurs when the cuticles of the hair are raised or damaged, resulting in an inability to retain moisture effectively. Therefore, while it may absorb moisture rapidly, it does not hold onto it well, leading to the hair becoming dehydrated.

In contrast, hair that retains moisture effectively would not be described as highly porous. Similarly, hair that is resistant to chemical treatments typically has a smoother cuticle layer, indicating lower porosity. Lastly, a very soft texture is usually associated with well-moisturized hair, which is the opposite of the characteristic feel of highly porous hair. Thus, the description of feeling dry and brittle aligns perfectly with the definition of highly porous hair.