High porosity hair is a hair type that is characterized by its ability to absorb and lose moisture quickly. This is due to the fact that the hair cuticle, which is the outermost layer of the hair shaft, is raised and has gaps in it. These gaps allow water and other molecules to easily penetrate the hair shaft.
High porosity hair can be beneficial because it is able to absorb a lot of moisture, which can make it soft and shiny. However, it can also be more prone to damage because the cuticle is not as protective.