Quick Summary / At A Glance
- Porosity is how well hair absorbs and retains moisture, and it is set by the cuticle layer.
- Low porosity hair has a tight cuticle, medium is slightly raised, and high is fully raised and leaky.
- Simple float, spray and curl-pattern tests can suggest your porosity type at home.
- Low hair needs light, water-based moisture; high hair needs deep conditioning and sealing.
- Heat, colouring, bleaching, sun and humidity can raise porosity, so protect hair and adapt your routine.
Knowing your porosity helps you choose the right products and techniques for your hair type and needs. It also helps you address common problems such as excessive dryness, frizz or product buildup.
Table of Contents
The Three Porosity Types Compared
| Type | Cuticle | How it behaves | Main care focus |
|---|---|---|---|
| Low | Tightly closed | Moisture struggles to enter; products sit on the surface, can take longer to dry and build up | Lightweight, water-based products |
| Medium | Slightly raised | Absorbs and retains moisture in balance; holds styles well | Balanced routine, regular conditioning |
| High | Fully raised | Absorbs moisture quickly but loses it easily; dry, frizzy, prone to breakage | Deep conditioning and sealing moisture in |
Porosity affects how well hair absorbs and holds water, and how effective products are. Tailoring your routine to it helps maintain moisture levels and improve the overall health and appearance of your hair.
Low, Medium and High Porosity in Detail
Low Porosity: Shiny, but Hard to Moisten
Low porosity hair often appears shiny and healthy, but it may feel dry or lack moisture. Products tend to sit on the surface rather than being absorbed, which can lead to limpness, greasiness and buildup.
Medium Porosity: the Balanced Middle
Medium porosity hair tends to be more versatile and less demanding, and it can hold styles well. Keep its balance with regular conditioning and hydration, and avoid extreme heat or chemical treatments.
High Porosity: Quick to Absorb, Quick to Dry Out
High porosity hair often appears dull and frizzy, and it is prone to breakage because moisture escapes easily. Focus on deep conditioning to help seal the cuticle and minimise moisture loss, and avoid harsh chemicals and excessive heat styling.
Three Simple Tests to Suggest Your Porosity
If products work well for other people but leave your hair lacklustre, porosity may be the reason. These three simple tests can help you identify where your hair falls on the porosity spectrum.
The Float Test: Float, Hover or Sink
Fill a glass or bowl with room-temperature water, drop in a clean strand of hair, and observe what it does. Floating on the surface suggests low porosity, staying midway suggests medium, and sinking straight to the bottom suggests high.
The Spray Bottle Test: How Fast Water Soaks In
Spritz a small section of clean, dry hair with water until damp, and watch how it responds. Quick absorption suggests high porosity, water sitting on the hair suggests low, and slow, uneven absorption suggests medium.
The Curl Pattern Test: Defined, Loose or Frizzy
Look at a freshly washed and conditioned strand, from roots to ends. Well-defined, uniform curls suggest low porosity, loose and less defined curls suggest medium, and frizzy or undefined curls suggest high.
Once you have a likely type, use the care sections below as your starting point. Adjust the routine as your hair responds over time.
What Changes Porosity: Genes, Weather and Treatments
Genetics shapes texture, density and strand diameter, which all affect porosity. Naturally curly hair tends to have higher porosity, thicker hair tends to have lower porosity, and fine strands may be more prone to higher porosity.
Humidity, heat and sun exposure can all raise porosity by lifting or damaging cuticles. Cold temperatures can also make cuticles contract, which affects porosity too.
Colouring and bleaching alter hair structure and increase porosity, and bleach in particular can cause significant damage to cuticles. Relaxing, perming and repeated heat styling also weaken protein bonds or cuticles, so hair loses moisture more easily.
Minimising exposure to these environmental factors, and avoiding excessive chemical treatments, can help maintain the natural porosity of your hair. Protect your hair from direct sunlight and limit heat styling to reduce further damage.
Caring for Low Porosity Hair: Help Moisture In
Clarify regularly to remove buildup that blocks moisture, using a clarifying shampoo once a month. Before washing, pre-poo with a lightweight oil or conditioner under a heat cap or warm towel, and wash with warm rather than hot water.
Deep condition regularly, ideally with heat from a steamer or a cap under a dryer, to improve absorption. Choose lightweight, water-based moisturisers and humectants such as glycerin or aloe vera, and avoid heavy butters and oils that sit on the surface.
Protein treatments can also help low porosity hair, by strengthening hair and improving moisture retention. Look for hydrolysed proteins or amino acids in products for this type.
Apply products to damp hair, in sections, using the praying hands method to smooth product down each strand. Seal with a light oil afterwards, such as argan or grapeseed oil.
Caring for Medium Porosity Hair: Keep the Balance
Deep condition once a week with a nourishing conditioner, and balance moisture with periodic protein treatments. The LOC method — liquid, oil, then cream — can lock in hydration: start with a water-based leave-in, seal with a lightweight oil, and finish with a creamy moisturiser.
Wash with lukewarm water, limit shampooing, and consider co-washing or a sulfate-free shampoo instead of over-washing. Detangle gently with fingers or a wide-tooth comb, air dry where possible, and trim regularly to remove split ends.
Useful products include hydrating shampoo and conditioner, a lightweight leave-in conditioner, and a weekly moisturising mask. If you use heat tools, apply heat protectant first and keep the temperature low.
Medium porosity hair can withstand some chemical treatments without excessive damage, because its cuticle lets a moderate amount of moisture in and out. Even so, the focus stays on maintaining moisture balance through regular conditioning and hydration.
Caring for High Porosity Hair: Keep Moisture In
Use sulfate-free shampoos and conditioners, which are gentler and do not strip essential moisture, and rinse with lukewarm water. Deep condition regularly, at least once a week, and use leave-in conditioner as an extra layer of moisture.
Look for protein-based products with proteins such as keratin or collagen, moisturising masks with natural oils, and lightweight oils such as argan or sweet almond oil to seal moisture in. Avoid excessive heat styling, and choose heat-free methods where possible.
A diluted apple cider vinegar rinse or a cold water rinse after conditioning can help smooth and seal cuticles. Protective styles such as braids, twists or updos, and a satin or silk pillowcase, reduce friction, exposure and moisture loss.
Building a Routine Around Your Porosity
Cleanse gently and regularly, massaging the scalp gently to minimise breakage. Deep condition once a week, follow with leave-in conditioner, and seal with a lightweight oil or serum to prevent frizz.
Protect hair by limiting heat styling, always using a heat protectant spray before heat, and wearing protective hairstyles against environmental stressors. For high porosity hair, sealing with heavier oils and butters and rinsing with cold water are routine points, and for low porosity hair, heat-activated deep conditioning helps absorption.
Porosity can change with chemical treatments or seasonal changes, so watch how your hair reacts and adjust products and treatments accordingly. If you need personalised help, consult a hair stylist or trichologist for advice based on your hair’s needs.
Frequently Asked Questions About Hair Porosity
Is Low or High Porosity Hair Better?
Neither is inherently better; it depends on individual preferences and your care routine.
How Do You Determine Hair Porosity?
Determining hair porosity involves conducting a simple test using water and observing how your hair absorbs it.
What Are Signs of High Porosity Hair?
High porosity hair is easily damaged, prone to frizz, absorbs moisture quickly, and dries out fast.
What Is Hair Porosity and Why Is It Important?
Hair porosity refers to your hair’s ability to absorb and retain moisture. Understanding your hair’s porosity can help you choose the right products and treatments for healthy hair.
Conclusion: Match Your Care to Your Cuticles
Once you know your porosity level, adjust your routine: lightweight products and heat during deep conditioning for low porosity, a balanced approach for medium, and intensive hydration with sealing oils for high. Experiment with techniques and products to find what works best for your hair.
Maintaining healthy hair is a journey, and porosity is not fixed for life. Keep checking how your hair behaves, especially after colouring, bleaching or heat styling, and change your routine when its behaviour changes.
This article is general information only and is not medical advice. Please consult a healthcare professional for personal advice.