What does hair porosity indicate?

Hair porosity refers to the hair's ability to absorb and retain moisture. It is an important characteristic that affects how hair behaves, how it responds to hair care products, and how well it can retain hydration. Porosity is typically categorized into three levels: low, medium, and high.

Low porosity hair has tightly packed cuticles, making it more resistant to moisture absorption and product penetration. This type of hair may require heat or specific techniques to effectively moisturize. Medium porosity hair has a balance of moisture retention and flexibility, allowing it to absorb products easily and maintain hydration. High porosity hair has gaps or holes in the cuticle layer, making it absorb moisture quickly but also lose it just as fast, often requiring more intensive conditioning to maintain balance.

Understanding hair porosity is crucial for choosing the right hair care products and methods, as it directly impacts the overall health and appearance of the hair. The other choices involve characteristics that do not relate directly to moisture absorption: thickness of the hair shaft refers to diameter, natural color pertains to pigmentation, and rate of hair growth is unrelated to how the hair interacts with moisture and products.