How to Know Your Hair Porosity

In this post, you'll learn how to discover your hair porosity, which helps especially for this with curly hair who are doing the curly girl method. As a curly girl myself, I've learned that understanding the porosity of my hair has made it much easier to know which hair products to use. You can have more success with your hair once this becomes clear and spend less money trying out different products!

How to Know Your Hair Porosity and Why It Matters for Healthy Hair

What Does Hair Porosity Mean?

Hair porosity refers to the hair's ability to absorb and maintain moisture. There are three levels of porosity – low, medium and high. It refers to how the cuticle lays on the cortex. Porosity can be genetic, but it can also be caused by damage (like coloring, bleaching, straightening, curling, excessive styling and manipulation) and it can be somewhat reversed with protein treatments and bond repair treatments. I have been able to change my hair from super high porosity (very damaged) to more medium porosity in just a matter of months with the protein and bond repair treatments. Click on the links in the sentence above to learn more about them!

From left to right – low porosity, medium porosity, high porosity

The Three Types

Low Porosity Hair

Low porosity hair has a cuticle that is smooth and very flat. Think of a smooth pipe. Water doesn't absorb well into this type of hair and usually sits on top. Products also do not absorb well into the hair and buildup happens quickly. It's usually more sensitive to protein (but could still benefit from a protein treatment from time to time).

Tips for Low Porosity Curlies:
Use Heat

Heat helps to open up the cuticle so that the hair cortex can absorb moisture. Use heat when deep conditioning (read my post on deep conditioning here) or conditioning by using a thermal heat cap or wear a shower cap in the shower so the conditioner can do its magic while you wash your body. The shower cap will act like a mini greenhouse to open up the cuticle!

Clarify Often

This going to be different for each person, but anywhere from once a week to twice a month is good for many low porosity curly girls. Here are some clarifying shampoos that are curly girl friendly:

Avoid Butters and Oils

Avoid products with heavy butters and oils – like Shea butter, coconut oil, grapeseed oil, almond oil, olive oil, fractionated coconut oil, etc. These ingredients will really weigh your hair down, making it limp and greasy.

Now, this is different when it comes to having these ingredients in shampoos and conditioners because often they have a different chemical structure when paired with other ingredients. I would especially avoid STYLING products with butters or oils in them. And in general, look for these ingredients in the first 5 of the list. After that, it's not going to be all that important.

Medium Porosity Hair

The cuticle in this hair is not as flat as low porosity, but is slightly raised so that water can penetrate the cortex easily. This is the easiest type of hair to have! It takes the least amount of maintenance. You'll know this is your type if your curls are elastic and bouncy (without much work). Your hair will easily accept and maintain moisture, and it can hold styles well and also hold color well. The hair does not need deep conditioning or protein as often as high porosity hair does.

High Porosity Hair

Curls often look and feel dry, they absorb water quickly, dry quickly, and often need more products. The cuticle is raised and the scales do not lay flat. It can be genetic or high porosity can be caused by chemical damage.

Tips for High Porosity Hair:

  • The hair needs products to seal in moisture – leave ins, creams, butters and oils will be your best friends!
  • Deep condition at least once a week
  • Do protein treatments every 4-6 weeks (see my post on that here)
  • Do bond repair treatments (see my post on that here)
  • Use minimal heat – air dry if at all possible! If not, make sure to diffuse your curls on low heat or cool heat. Another option is to dry your hair to 25% or 50% dry, then let it air dry, or do the opposite (air dry first, then finish with the diffuser).
  • Rinse with cool water to close the cuticle & seal in moisture.
How Using Bond Repair Treatments like OlaPlex Saved My Damaged Hair!

My Hair Porosity Discovery

I thought I had Low Porosity Hair at First…I was wrong!

When I first started the curly girl method, I thought for sure I had low porosity hair. I had very long hair that took 6 hours to dry and pretty much every leave in conditioner left my hair feeling heavy and icky. And my hair floated in the hair strand test, even with a washed, product-free strand!

But, I continued to find that my hair wasn't doing well with hair gels – the curl wouldn't last and I'd end up washing by day 3. My hair lost moisture within a day or two. This is partly due to the fact that my hair was still healing and getting stronger.

One day, I left deep conditioner in my hair and found that my hair loved it. This got me to thinking that my hair loves curl creams and not gels! I noticed that it looks dull, dry and frizzy easily. Hmm, sounding more and more like HP hair!

Now that I've discovered this, I use curl creams, deep condition one to two times a week, do regular protein and OlaPlex (bond repair treatments) and my hair is totally transforming into shinier, healthier curls.

Hair Porosity Strand Tests

There are several different types of strand tests and I've tried two of them. When I was first starting out, I don't think any of these test were accurate for me. I knew so little about hair and had so little experience with understanding porosity and which products are good for me. But I wanted to share them with you in case they help you and work for you!

The Floating Test – Left to Right – High, Medium, and Low Porosity

Hair Porosity Floating Test

Take a strand of clean hair (no styling products on it, either) and put it in a cup of water. Break the water tension on top and see if the hair floats (low porosity), goes to more of the middle (medium), or sinks to the bottom (high porosity).

I've done this test three times. My hair stays on top every time, but I'm almost 100% sure that most of my hair is high porosity! I'll get to why I think that later. So, I feel like this test is pretty inaccurate.

Hair Porosity Strand Test

Gently stretch a strand of hair from different parts of your head – the canopy (crown), nape, in the middle. Run your fingers up and down it to see how it feels.

  • Low Porosity – it'll feel dense, hard, and smooth
  • Medium Porosity – it'll feel smooth
  • High Porosity – it'll feel rough, dry and might even break

Hair Porosity Water Test

Spray water on your dry hair with a spray bottle, or spray it on a section. Again, this works best if your hair is clean and and product-free.

  • Low Porosity – it'll bead and sit on top of the hair. You'll be able to see water droplets
  • Medium Porosity – absorbs some, less beading
  • High Porosity – absorbs quickly

See all of my curly hair posts here!


  1. Hello ! I came across your article and it was very helpful! Thank you for sharing this information with us. I tried doing the 3 tests and I am still confused about my porosity. I have very fine low dense hair, I’ve done all three tests. The first test is when I put the hair in the cup. The hair was floating at the top. The second test the strand test, was when I went I ran my fingers on my hair strand. When i run it through 2 or 3 hand strands together it does feel dry and brittle and rough and there are even tiny breakage knots as in it doesn’t feel smoothe. But when I gather a thicker strand ( 10. Hair strands together) it feels soother. The last test was wetting my hair. I washed my hair today so it was all wet. I finished my shower at 3 pm. 40 to 45 min later my hair was 60 to 70 percent dry. A little beading at the bottom but mostly dry everywhere at the top of my head and middle part of my hair. The bottom is damp. That’s why I’m confused . Am I low or high porosity. My hair is fine and not thick at all??‍♀️Thanks for your help

    1. It sounds like to me that your hair is high porosity, as air drying in 45 minutes is really fast! How long is your hair? If it’s really short, then 45 minutes wouldn’t be short. You can have fine hair and it be high porosity if you have coloring/relaxing/perming/highlighting (basically, chemical) damage. You can also have high porosity hair like me, even if it’s healthy just based on it being kinky curly (my hair used to have teeny tiny ringlets, and has relaxed over the years with pregnancies. But the texture is still the same).

  2. Hi! I am interested in using natural products only. I have been following CGM ways for over a year. I love my hair but have not really perfected the method. I believe my hair is low porosity, medium coarse, curls that look similar in size and shape to your own. I would like to know if you think my homemade flax seed gel has too much protein in it for me? I’m not sure if my hair likes protein or not. I don’t believe so. By day 3 I have lost lots of definition and starting to look a bit oily. (Day 1 I wash, hair mask, condition, then apply leave in, curl cream, and my home made gel).
    P.S. I am a YL lover, too! Spearmint and Lavender go into my gel!
    Any help would be appreciated! ✨?

    1. Hi Stacy! Okay, for a line of all natural products I recommend two different brands – InnerSense Organics and BrioGeo. Flax Seed Gel should be just the perfect amount of protein – I don’t think it would have too much, but if your hair seems upset, then do a deep conditioning treatment and see if your hair does better.

  3. I read your article. It has helped me a lot to understand the porosity of my hair. your work is good keep it up as well! I have a question? if i use coconut oil on my will it be Absorbed on my hair. My hair type is low porosity hair.

  4. Hi Sara, Thanks for sharing the idea of finding porosity of hair with heat. I’ve learned so many articles but your article is so great. My head is so dry & I am facing low porosity hair. I used Pre-Poo Coconut Oil، But it didn’t matter. Have you ever faced Low Porosity Hair problem?

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