What Is Hair Porosity?
Hair porosity is your hair’s ability to absorb and retain moisture. It is influenced by the structure and condition of the hair’s cuticle — the outermost layer of each strand.
Think of your hair cuticle like a protective layer around the strand. When the cuticle is tightly packed, moisture may take longer to enter. When it is more open, moisture can enter easily but may also escape more quickly.
Why Does Porosity Matter?
Knowing your hair’s porosity can help you understand how your hair responds to water, conditioners, leave-ins, creams, and styling products. It can also help you build a routine that provides the right level of moisture without unnecessary buildup.
Porosity is not the same as curl type. You can have any curl pattern with low, medium, or high porosity.
Low Porosity
Moisture has a harder time entering the hair and products may sit on the surface.
Medium Porosity
Hair generally absorbs and retains moisture at a balanced rate.
High Porosity
Moisture enters easily but can also escape quickly, which may leave hair feeling dry.
How to Identify Your Hair Porosity
Hair porosity describes how easily your hair absorbs and holds onto moisture. Understanding your porosity can help you choose products and build a routine that works better for your hair.
Porosity can vary across your hair and can change with heat, chemical treatments, bleaching, and damage. Use these signs as a guide rather than a strict label.
Low Porosity
Low-porosity hair has a tightly packed cuticle layer, which can make it harder for water and products to penetrate the hair.
- Water may sit on the hair before being absorbed.
- Products can feel like they sit on top of the hair.
- Hair may take a long time to become fully wet.
- Hair can take a long time to dry.
- Heavy products may cause buildup easily.
Tip: Lightweight, water-based products and occasional clarifying can work well for many low-porosity curls.
Medium Porosity
Medium-porosity hair generally absorbs and retains moisture without requiring as much effort.
- Hair gets wet relatively easily.
- Products absorb without sitting heavily on the surface.
- Hair holds moisture reasonably well.
- Hair usually dries at a moderate rate.
- Hair is generally easier to style and maintain.
Tip: Medium-porosity hair often works well with a balanced routine of cleansing, conditioning, and styling.
High Porosity
High-porosity hair has a more open or raised cuticle structure, allowing moisture to enter quickly but also escape more easily.
- Hair becomes wet very quickly.
- Hair may dry quickly.
- Hair can lose moisture and feel dry soon after washing.
- Frizz and tangling may be more noticeable.
- Hair may absorb products quickly.
- Damaged, bleached, chemically treated, or frequently heat-styled hair can become more porous.
Tip: Moisturizing products combined with conditioning and products that help seal in moisture may be useful.
Look at How Your Hair Behaves
Consider your hair's everyday behavior to understand its porosity level.
- How quickly does your hair get fully wet?
- How quickly does it dry naturally?
- Do products absorb easily or seem to sit on top?
- Does your hair lose moisture quickly?
- Does your hair experience buildup easily?
- Has your hair been bleached, chemically treated, or frequently exposed to heat?
Slow absorption
Low Porosity
Balanced absorption
Medium Porosity
Fast absorption
High Porosity
Important: The Water Float Test
You may have heard of the hair strand water-float test. However, it isn't a reliable way to determine hair porosity because results can be affected by product buildup, hair density, water temperature, and other factors. Your hair's everyday behavior is more useful.