PSI Barbering Practice Exam 2026 - Free Barbering Practice Questions and Study Guide

High porosity in hair is indicative of a compromised cuticle layer. The cuticle is the outermost layer of the hair shaft, consisting of overlapping cells that protect the inner layers of hair. When the cuticle is healthy and intact, it provides a barrier that prevents excessive moisture loss and protects the hair from damage. However, if the cuticle is damaged, the hair's ability to hold onto moisture diminishes, leading to increased porosity.

When hair has high porosity, it often absorbs moisture quickly but also loses it just as rapidly, giving it a dry and brittle appearance. This condition can be a result of various factors such as chemical treatments, heat styling, or environmental stressors that wear down the cuticle, making the hair more porous. Therefore, high porosity is a clear sign that the cuticle layer is likely damaged and unable to effectively protect the inner structure of the hair.