Have you ever wondered why a conditioner works beautifully for someone else but seems to sit on top of your hair? Or why your hair absorbs moisture quickly but somehow still feels dry shortly afterward?
The answer may have something to do with hair porosity.
Understanding your hair's porosity can help explain how your hair absorbs and retains moisture, why certain products work better than others, and how you can build a routine that better suits your hair.
What Is Hair Porosity?
Hair porosity describes your hair's ability to absorb and retain moisture.
The outermost layer of each hair strand is called the cuticle. You can think of the cuticle as a protective layer made up of tiny overlapping scales.
How tightly or loosely those scales sit together affects how easily water and hair care products can enter and leave the hair.
Hair porosity is generally described as low, medium, or high.
What Is Low Porosity Hair?
Low porosity hair has a tightly packed cuticle layer, which can make it more difficult for water and products to penetrate the hair.
You may have low porosity hair if:
- Water tends to bead on your hair before being absorbed
- Your hair takes a long time to become completely wet
- Conditioner seems to sit on your hair
- Products can easily make your hair feel heavy or coated
- Your hair takes a long time to dry
With low porosity hair, adding more and more product isn't necessarily the answer. Because the hair doesn't absorb moisture as readily, heavy products can accumulate on the surface.
A simpler routine and lighter applications can often work better.
What Is High Porosity Hair?
High porosity hair has a more open or raised cuticle, allowing moisture to enter the hair easily.
The challenge is that moisture can also escape just as easily.
You may have high porosity hair if:
- Your hair absorbs water very quickly
- Products seem to disappear into your hair
- Your hair dries relatively quickly
- Your hair frequently feels dry or rough
- You experience frizz or tangling
- Your hair is prone to breakage
High porosity can be a natural characteristic of your hair, but damage from colouring, bleaching, chemical treatments, heat styling, and everyday wear can also increase porosity.
For high porosity hair, the goal is often to add moisture while helping the hair retain it.
What About Medium Porosity Hair?
Medium or normal porosity falls somewhere between the two.
The cuticle allows moisture into the hair without releasing it too quickly. As a result, medium porosity hair is often relatively easy to manage and responds well to a balanced hair care routine.
That doesn't mean medium porosity hair can't become dry or damaged. Colouring, heat styling, environmental exposure, and other factors can change how your hair behaves over time.
How Can You Tell What Hair Porosity You Have?
You've probably seen the popular "hair porosity test" online where a strand of hair is dropped into a glass of water.
If it floats, it's supposedly low porosity. If it sinks, it's high porosity.
While it's an interesting experiment, it isn't necessarily the most reliable way to understand your hair. Product residue, natural oils, and the thickness of individual strands can all influence whether hair floats or sinks.
A better approach is to pay attention to how your hair behaves during your normal routine.
Ask yourself:
- Does my hair become wet immediately or take time?
- Does conditioner absorb easily or seem to coat the surface?
- Does my hair dry quickly or take hours?
- Does my hair stay moisturized after conditioning?
- Do products frequently leave my hair feeling heavy?
- Is my hair prone to dryness, frizz, tangles, or breakage?
Looking at several of these characteristics together can give you a better understanding of your hair than relying on one test.
Why Does Conditioner Sometimes Sit on Top of My Hair?
This is a common complaint among people with lower porosity hair.
Because the cuticle is tightly packed, richer conditioners and styling products may have difficulty penetrating the hair. Applying too much can leave the hair feeling coated, greasy, or weighed down.
Try using smaller amounts and give your products time to work before deciding you need more.
Why Does My Hair Absorb Everything but Still Feel Dry?
This can happen with higher porosity hair.
Moisture and products may enter the hair easily, but an open or damaged cuticle can make it difficult to hold onto that moisture.
That's why someone with high porosity hair may feel like their hair "drinks up" conditioner but becomes dry again surprisingly quickly.
A routine focused on hydration, conditioning, and strengthening can help improve the way the hair feels and behaves.
Can Damaged Hair Become More Porous?
Yes. Hair porosity isn't necessarily something that remains exactly the same throughout your life.
Repeated bleaching, colouring, chemical processing, excessive heat styling, and other forms of damage can affect the cuticle and make hair more porous.
This is why you may notice that heavily highlighted ends behave very differently from newer hair closer to your roots.
Products designed to support hydration and damaged hair, such as Kevin Murphy Flawless 6 in One Bond Builder, can be incorporated into a routine when strengthening and conditioning are priorities.
Choosing Products Based on How Your Hair Behaves
Understanding porosity isn't about putting your hair into a permanent category. It's about learning what your hair is telling you.
If your hair becomes weighed down easily, you may need to use less product or choose a lighter routine.
If your hair absorbs moisture quickly but becomes dry again, hydration and moisture retention may need more attention.
Professional hair care collections such as Amika Hydro Rush and Pureology Hydrate can help support hair where hydration is a priority.
Hair Care Canada also carries professional hair care from ELEVEN Australia and Neuma, giving you additional options when building a routine around your individual hair needs.
The goal isn't necessarily to use more products. It's to understand your hair well enough to choose and use the right products more effectively.
Frequently Asked Questions
What does hair porosity mean?
Hair porosity describes how easily your hair absorbs and retains moisture. It is influenced by the condition and structure of the hair's outer cuticle.
How do I know if I have low porosity hair?
Low porosity hair often takes longer to become wet and dry, while products may sit on the surface or make the hair feel coated.
How do I know if I have high porosity hair?
High porosity hair usually absorbs water and products quickly but may lose moisture just as quickly. It can also be more prone to dryness, frizz, tangles, and breakage.
Why does product sit on top of my hair?
A tightly packed cuticle can make it harder for products to penetrate the hair. This is commonly associated with lower porosity hair.
Why does my hair absorb conditioner but still feel dry?
Higher porosity hair can absorb moisture easily but may have difficulty retaining it, causing hair to feel dry again relatively quickly.
Can colouring change my hair porosity?
Yes. Colouring, bleaching, chemical treatments, heat styling, and other forms of damage can affect the cuticle and increase hair porosity.
Can different parts of my hair have different porosity?
Yes. For example, newer hair near the roots may behave differently from older, chemically treated or damaged ends.
Is low or high porosity hair better?
Neither is necessarily better. Porosity simply helps describe how your hair absorbs and retains moisture. Understanding it can help you choose a routine that better suits how your hair behaves.
Understand Your Hair with Hair Care Canada
There's no single hair care routine that works for everyone.
Hair texture, density, damage, styling habits, environment, and porosity can all influence what your hair needs.
Understanding your hair porosity gives you another useful piece of the puzzle. Once you recognize how your hair absorbs and holds onto moisture, it becomes easier to understand why certain products work well while others don't.
At Hair Care Canada, you'll find professional hair care solutions from brands including Kevin Murphy, Amika, Pureology, ELEVEN Australia, and Neuma to help you build a routine that works with your hair rather than against it.
Visit HairCareCanada.ca to explore professional hair care products suited to your individual needs.
