Does your hair look dry no matter how much you moisturize it? Or does it get weighed down quickly after any oil? The answer may lie in its porosity. Porosity is your hair's ability to absorb and retain moisture, and it's determined by the structure of the strand's outer layer. Understanding your porosity saves you from buying products that don't suit you and helps you build an effective routine instead of guessing.

How to Test Your Porosity at Home

Two simple tests are all you need, along with clean hair and a little observation.

  • The glass test: place a clean, dry strand of hair in a glass of water. If it floats for a long time, your porosity is low; if it sinks quickly, it's high; if it stays in the middle, it's medium.
  • The slide test: run your fingers along a strand from the ends toward the roots. A rough, bumpy feel usually means high porosity, while a very smooth surface means low porosity.

Tips for an Accurate Test

Use clean hair free of oils and products, since residue distorts the result. Repeat the test on more than one strand, as hair can vary from one area to another.

What Each Result Means

Each porosity type behaves differently with moisture and products.

  • Low porosity: the outer layer is closed, so moisture struggles to get in but stays locked once it does. Hair builds up product quickly and prefers light formulas.
  • Medium porosity: the easiest to care for, absorbing and retaining moisture in good balance.
  • High porosity: the layer is open, so hair absorbs moisture fast but loses it just as fast, and it needs rich hydration and sealing layers.

How to Choose Your Products Accordingly

Low-porosity hair benefits from light, quickly absorbed oils like argan and gentle heat to open the layer. High-porosity hair prefers richer butters and oils to seal in moisture and reduce dryness. Medium porosity gives you more freedom to experiment. The idea is to work with your hair's nature, not against it.

Knowing your porosity turns product choice into an informed decision rather than luck. As a Moroccan private-label manufacturer, we help entrepreneurs develop authentic, quality-certified oils and care formulas suited to different porosity types, ready to carry their own brand.