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

The term "porosity" in relation to hair specifically refers to the hair's ability to absorb moisture. When hair has high porosity, it means that the hair cuticles are open or damaged, allowing moisture to enter easily but also causing it to escape just as quickly. Conversely, hair with low porosity has tightly closed cuticles, making it more resistant to moisture absorption. Understanding porosity is crucial for effective hair care, as it influences the choice of products and treatments. It is essential for stylists and individuals to recognize the porosity of their hair to maintain its health and manage moisture properly.