Hair porosity is simply how easily your hair absorbs and holds moisture. It depends on your cuticle, the outer layer of each strand. When the cuticle lies flat, moisture struggles to get in. When it is raised or damaged, moisture rushes in and escapes just as fast. Knowing where you sit helps you pick products that actually suit your hair instead of fighting it.

Answer these 7 short questions about things you can already observe: how your hair wets, dries, and handles products. There are no right or wrong answers, and the whole quiz takes about two minutes. Below the quiz you will also find three at-home tests you can try, full routines for each porosity type, protein guidance, and answers to common questions. Your result is a starting-point indication, not a diagnosis.

Take the 2-Minute Porosity Test

0 of 7 answered

Please answer all 7 questions before seeing your result.

1. When you wet your hair in the shower, how fast does it get fully wet?
2. How long does your hair take to air-dry, with no heat styling?
3. When you apply a hair oil or leave-in product, what usually happens?
4. On a humid or rainy day, how does your hair behave?
5. How does your hair handle colour, bleach, or heat styling?
6. How often does your hair tangle, snap, or develop split ends?
7. The float test, as one rough indicator: a clean, dry strand dropped in a glass of water — what usually happens?

Before you start: try all three at-home tests

No single home test is reliable on its own, so use at least two of the three below and trust the result when two of them agree. Test more than one strand, and test the roots separately from the ends, because ends are usually more porous than roots. Hair from the crown and from the underlayer can behave differently too.

Prepare your hair first. Wash with a clarifying shampoo, skip conditioner, and let your hair dry fully with no products. Product residue and natural oils can change every one of these tests, which is why freshly washed, product-free hair gives the truest reading.

1. The spray test

  1. Take a small section of clean, fully dry hair.
  2. Mist it lightly with room-temperature water from a short distance.
  3. Watch what the water does. If it beads up and sits on the surface, that points to low porosity. If it soaks in within seconds, that points to high porosity. If it absorbs steadily after a short pause, that points to medium porosity.

2. The slide test

  1. Take a single clean, dry strand between your thumb and finger.
  2. Slide your fingers gently upward along the strand, from tip toward root.
  3. If the strand feels smooth all the way, that points to low porosity. If it feels rough or bumpy, that points to high porosity, because raised cuticle scales catch as you slide.

Take this one lightly: the lift it tries to feel is very small, and it is easy to imagine a bump that is not really there. Use it as a supporting clue, not as the deciding test.

3. The float test

  1. Drop one clean, dry strand into a glass of room-temperature water.
  2. Wait a few minutes. If it keeps floating, that points to low porosity. If it sinks slowly toward the middle, that points to medium porosity. If it sinks quickly to the bottom, that points to high porosity.

The float test is popular online, but it is the least reliable of the three. Surface oil, product build-up, and even strand thickness can change whether a strand floats or sinks, and different strands from the same head can behave differently. That is why this quiz asks about everyday behaviour first — wetting, drying, absorption, frizz, and breakage — and treats the float test as only one small clue among seven.

The wet-stretch check: a bonus clue about elasticity

Take a single wet strand and stretch it gently. Healthy, elastic hair stretches a little and springs back. Hair that snaps almost at once may need more moisture and gentler handling. Hair that stretches a long way without springing back may need protein support. This check tells you about elasticity and damage, not porosity directly, but it pairs well with your quiz result when you plan a routine.

What is hair porosity?

Each hair strand is covered in tiny overlapping cuticle scales, a bit like roof tiles. In low-porosity hair those tiles lie flat and tight, so water and products struggle to get in — but once moisture is inside, it stays put. In high-porosity hair the tiles are raised or chipped, often by bleach, colour, heat, or rough handling, so moisture rushes in and escapes just as fast. Medium, or normal, porosity sits in between: the cuticle lets a reasonable amount in and holds it for a reasonable time. Porosity is not good or bad on its own. It is simply the reason the same product can feel perfect on one person and heavy, or useless, on another.

Porosity is also only one variable. Strand thickness, hair density, curl pattern, and scalp condition all change how a routine feels, so two people with the same porosity can still need different products.

Why your history matters

Porosity is not fixed for life. Bleach, highlights, permanent colour, relaxers, perms, keratin treatments, and frequent flat-ironing or blow-drying all lift or chip the cuticle, and that pushes porosity upward over time. Sun exposure adds to the same effect. That is why a person who coloured or bleached their hair often tests higher at the ends, which carry the oldest damage, than at the roots, which are new growth.

Because of this, a result that surprises you is worth re-checking after a change: a fresh colour service, a summer of strong sun, or a few months of gentler care can all move the picture. As a habit, retest every few months, and test roots and ends separately when your hair has a long damage history.

Protein and moisture: the balance that matters

Think of moisture as what fills the hair and protein as what patches the gaps in the cuticle. High-porosity hair, with its open cuticle, usually benefits most from protein: it temporarily fills the gaps, so moisture stays in longer. Many routines suggest a protein treatment about once a month for high porosity. Low-porosity hair, with its tight cuticle, needs protein far less often — many guides suggest roughly every six weeks — because excess protein on low-porosity hair can make it feel stiff, dry, and brittle. That stiff, straw-like feeling is the classic sign of protein overload, and the fix is to pause protein and return to moisture for a while.

Medium porosity sits in between: an occasional protein boost, roughly monthly, is usually enough, with the focus kept on balanced moisture. Whatever your type, change one product at a time, so you can tell what actually helped.

Routines by porosity

Match the weight of your products to your porosity, and build the routine around wash day, when most of the work happens.

Low porosity routine

  • Clarify regularly, so build-up does not block moisture from getting in.
  • Wash with warm water and apply products to soaking-wet hair, which absorbs more easily than damp hair.
  • Use gentle warmth to help absorption, such as a warm towel or a plastic cap over a mask.
  • Prefer light products: light oils, light leave-ins, and a weekly mask rather than heavy butters.
  • Try a light oil as a pre-shampoo treatment for about 30 minutes before washing.

Medium porosity routine

  • Keep a regular washing and conditioning routine, with a deep-conditioning mask weekly or every two weeks.
  • Use a protein treatment about once a month as maintenance.
  • Trim the ends regularly, protect against excess heat, and keep product weight balanced — neither very heavy nor very light.
  • You have the most freedom to experiment, so change one thing at a time and watch how your hair responds.

High porosity routine

  • Seal moisture in layers: a water-based leave-in first, then a cream, then a heavier oil to seal. This layering approach is often called the LOC or LCO method.
  • Try a heavier oil as a pre-shampoo treatment, which helps the hair lose less moisture during washing.
  • Use a deep mask weekly, rinse with cool water, and detangle gently with a wide-tooth comb, starting at the ends.
  • Limit heat and chemical treatments where you can, protect against strong sun, and trim regularly to keep split ends from travelling up the strand.
  • If your water is hard, mineral build-up can leave hair dull and rough. A clarifying wash now and then, or a filtered final rinse, helps.

What not to do, by porosity

Low porosity: do not pile on heavy butters and thick oils — they sit on top, feel greasy, and block the moisture underneath. Do not skip clarifying, and do not judge a product after one use on dry hair, when absorption is at its worst.

Medium porosity: do not overload a working routine with very heavy products, and do not change five products at once. When something goes wrong, you will not know which change caused it.

High porosity: do not rub wet hair roughly with a towel, do not use high heat daily, and do not skip the sealing step. Without a seal, the moisture you just added escapes before it does any good.

How to use your result

Start with the routine for your result, give it two or three weeks before judging it — hair rarely changes its mind overnight — and change one thing at a time after that. Patch test any new oil or product before full use: our patch test timer walks you through the waiting period. For texture-specific guidance, see our guide to argan oil for different hair types and, for curly hair, our guide to argan oil for curly hair.

Frequently asked questions

Can porosity change over time?

Yes. Colour, bleach, heat styling, and sun exposure raise porosity, while months of gentle care, regular trims, and less chemical processing can bring it back down. Retest every few months, especially after a colour service or a change in routine.

Is the float test reliable?

Not on its own. Residue, natural oils, and strand thickness can all change the result, and strands from the same head can disagree. Use it together with the spray test and the slide test, and trust the answer when two of the three agree.

Does frizz automatically mean high porosity?

No. Frizz can come from humidity, damage, dryness, or a cut that does not suit your texture. Frizz plus fast wetting, fast drying, and quick product disappearance together point to high porosity. Frizz alone does not.

Is bleached hair always high porosity?

Usually, but not always. Bleach lifts the cuticle, so bleached sections normally test high, especially at the ends. The roots, which are unbleached new growth, often test lower. Test sections separately rather than judging the whole head by its most damaged part.

Does hard water affect porosity?

Hard water does not change your true porosity, but mineral build-up can make hair feel rough, dull, and hard to manage, which mimics high porosity. A clarifying wash now and then clears the build-up so you can see your real hair again.

Should I deep-condition overnight?

Overnight deep conditioning suits high porosity best, because that hair loses moisture fast and benefits from a long soak. For low porosity, a shorter session with gentle warmth usually works better, since the cuticle is slow to let anything in and an overnight soak adds little.

Which porosity is the best to have?

None of them. Each type has its own needs: low porosity holds moisture well once it gets in, medium porosity is the most flexible, and high porosity absorbs treatments quickly. The best porosity is the one you understand and care for correctly.

Starting-point indication: this quiz is an educational self-assessment, not a medical diagnosis. It does not promise hair growth or any other result. Porosity can also change over time with colour, heat, and damage, so retake the quiz if your hair changes. Patch test new products and stop use if irritation appears.

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