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

The term "porosity" specifically refers to the hair's ability to absorb moisture. Hair porosity is a key characteristic that determines how well hair can retain moisture, as well as how effectively it interacts with various hair products. Hair can be classified into three main porosity levels: low, medium, and high.

Low porosity hair has tightly closed cuticles, which makes it less absorbent and often leads to a struggle in getting moisture in. Medium porosity hair, on the other hand, has a balanced structure that allows moisture to enter and stay effectively. High porosity hair has gaps and holes in its cuticle, enabling it to absorb moisture easily but also making it prone to losing moisture quickly.

Understanding porosity helps in choosing the right products and treatments, as it influences how hair behaves with moisture, oils, and styling products. By knowing the porosity level, individuals can tailor their hair care routines to improve moisture retention and overall hair health.