What is the primary cause of hair porosity?

The primary cause of hair porosity can indeed be attributed to a combination of factors, including genetics, environmental influences, and chemical processing.

Genetics plays a crucial role as it determines the natural structure and characteristics of a person’s hair, including its ability to retain moisture and the size of the hair cuticle layers. Environmental factors such as humidity, sun exposure, and pollution can affect hair health and porosity over time. For instance, excessive sun exposure can damage the hair cuticle, leading to increased porosity.

Chemical processing is also significant, as treatments like coloring, perming, and relaxing can alter the hair's structure. These processes can degrade the cuticle layer, making it more porous by allowing moisture and chemicals to penetrate more easily.

Considering that hair porosity is influenced by an interplay of all these elements, the answer highlights that understanding porosity requires a holistic view of the various factors that contribute to it. Each factor can independently or collectively affect the hair's ability to absorb and retain moisture, thus validating the choice that all of the aforementioned causes contribute to hair porosity.