Understanding Hair Porosity — What It Is, How to Test It, and a Routine That Actually Works
Hair porosity is one of those beauty terms that sounds fancy but is actually super practical. In plain language: porosity describes how well your hair absorbs and retains moisture. Knowing your hair’s porosity helps you choose the right products and routines so your hair looks healthier, feels less frizzy, and breaks less. This guide explains the three porosity types, easy at-home tests, why it matters, and realistic routines for each type.
What is hair porosity?
Porosity refers to the condition of the hair cuticle — the outer layer made of overlapping scales. If those scales lie flat and tight, moisture has a harder time getting in (low porosity). If the scales are raised or damaged, moisture gets in easily but also escapes easily (high porosity). Normal porosity means the cuticle i...

