Low vs High Porosity Hair in Singapore: What Causes it?

Key Takeaways

• Hair porosity is about how your hair absorbs and holds moisture, not how oily or dry it feels
• Singapore’s humidity, frequent washing, and colouring habits directly affect hair porosity over time
• Low porosity hair resists moisture; high porosity hair absorbs fast but loses it just as quickly
• Popular tests like the float test are unreliable on their own and should be cross-checked
• Understanding the cause of your porosity matters more than copying trending routines

Hair porosity explains why some hair care products sit on your hair doing nothing, while others disappear but leave your hair dry again an hour later.

In Singapore, this confusion is common. Between humidity, daily showers, air-conditioning, and frequent colouring or heat styling, many people end up with routines that sound correct but never quite work. 

Hair feels greasy at the roots, dry at the ends, frizzy outside, flat indoors, and no one can agree whether it needs more moisture or less.

Hence today, we will break down what low and high porosity hair actually mean, what causes them in our climate, and why understanding the cause matters more than blindly switching shampoos or treatments.

What Is Hair Porosity and Why Does It Matter in Singapore’s Climate?

Hair porosity refers to how open or closed your hair cuticle is, which controls how easily moisture enters and how quickly it escapes.

Think of the cuticle like roof tiles. When they lie flat, water struggles to get in. When they are lifted or damaged, water rushes in but leaks out just as fast. 

This has nothing to do with how thick your hair is or whether it feels oily at the scalp.

Porosity matters more than people realise because of three daily realities:

• High humidity that constantly pushes moisture into the hair
• Frequent washing due to sweat and heat
• Regular exposure to air-conditioning that dries hair out indoors

These conditions exaggerate porosity behaviour. 

“Low porosity hair can feel coated and heavy very quickly, while high porosity hair can look frizzy outdoors but dry indoors within minutes.”

Low vs High Porosity Hair

Feature	Low Porosity Hair	High Porosity Hair
Cuticle behaviour	Tightly closed	Raised or damaged
Water absorption	Slow	Very fast
Drying time	Long	Short
Product absorption	Poor at first	Immediate
Common issue	Build-up, flatness	Dryness, frizz
Typical cause	Naturally tighter cuticle structure; product build-up that makes hair behave more resistant to moisture	Naturally more open cuticle in some hair types; repeated colouring, bleaching, heat and chemical treatments

What Causes Low Porosity Hair?

Low porosity hair usually has tightly packed cuticles that resist water, products, and treatments.

They  develop over time due to product habits such as heavy conditioners, oils, silicones, and infrequent clarifying can create build-up that seals the cuticle even further. 

Common triggers for low porosity hair include:

• Consistent use of heavy creams and oils
• Rare clarifying or chelating washes
• Product layering without proper cleansing
• Avoiding heat entirely during conditioning

This is why low porosity hair often feels dry even after conditioning, yet greasy or coated a day later.

What Causes High Porosity Hair?

High porosity hair has raised or damaged cuticles that absorb moisture quickly but struggle to retain it.

High porosity can be natural (especially in some curly, coily, gray or very light hair) or it can develop over time from physical or chemical damage. This includes:

• Colouring and bleaching
• Rebonding and perming
• Frequent high-heat styling (blow-dryers, irons, tongs)

Environmental exposure also plays a role. Sun, saltwater, and chlorinated pools can weaken the cuticle over time, and frequent washing combined with rough towel-drying, wet brushing, or hot styling can add to that wear.

Once the cuticle is compromised, hair absorbs water fast and then dries out quickly in air-conditioned spaces.

How Do You Tell If You Have Low or High Porosity Hair?

No single test is accurate on its own, hair porosity is best identified through repeated patterns, not one-off tricks.

Many people rely on the float test, but it is unreliable on its own!

Water quality, leftover product, and even hair thickness can affect the result. A better approach is to observe how your hair behaves across different situations.

If Your Hair Leans Toward Low Porosity, You’ll Notice:

Water resistance and slow response

• Hair takes a long time to get fully wet
• Water tends to bead or sit on the surface at first

Product behaviour

• Conditioners and treatments sit on the hair before absorbing
• Products feel like they coat the hair rather than sink in

Drying pattern

• Hair dries slowly, even in warm or humid conditions

Build-up signals

• Hair feels greasy or heavy quickly
• Clarifying suddenly makes a big difference

If Your Hair Leans Toward High Porosity, You’ll Notice:

Fast absorption, fast loss

• Hair gets wet almost immediately
• Moisture disappears quickly once hair starts drying

Texture changes

• Hair feels soft when wet but rough once dry
• Tangling happens easily, especially at the ends

Drying pattern

• Hair dries very quickly, even without heat

Moisture frustration

• Products absorb instantly but dryness returns shortly after

A More Reliable At-Home Check: The Spray Test

The spray test works better than the float test for most people.

Lightly mist clean, dry hair with water and observe what happens:

• If droplets sit on the surface before slowly absorbing, porosity is likely low
• If water absorbs immediately, porosity is likely high

How Should Low Porosity Hair Be Cared for in Singapore?

Low porosity hair needs help letting moisture in, not more products sitting on top.

Step 1: Remove build-up first

In Singapore, sweat and product layering cause residue quickly. If hair feels greasy but still dry, clarify before adding more moisture.

Step 2: Condition on very wet hair

Apply lightweight, water-based conditioners on soaking-wet hair so water helps carry moisture into the cuticle.

Step 3: Use gentle heat occasionally

Shower steam or a warm towel during conditioning helps tight cuticles relax and absorb better.

Step 4: Rinse thoroughly and keep products light

Leftover product causes heaviness. Rinse well, then use minimal leave-in or serum, mainly on the ends.

If hair feels soft briefly but greasy soon after, the issue is usually build-up, not lack of moisture.

How Should High Porosity Hair Be Managed in Singapore?

High porosity hair absorbs moisture quickly, but loses it just as fast.

Step 1: Cleanse gently to avoid stripping

High porosity hair is already open. Over-cleansing makes moisture loss worse, especially with daily washing.

Step 2: Rehydrate immediately after washing

Apply conditioner while hair is very wet so moisture fills the gaps in the cuticle before drying begins.

Step 3: Seal moisture before stepping into air-conditioning

Use a light cream or leave-in, then a small amount of oil or serum to slow moisture loss indoors.

Step 4: Reduce damage between washes

Limit heat, handle wet hair gently, and use protein sparingly to support weakened cuticles without making hair stiff.

If hair feels soft when wet but dry again shortly after, it needs better sealing, not heavier products.

What Hair Products Should You Buy Based on Porosity?

Porosity-friendly routines work best when each product has a clear job.

Instead of buying more, focus on what each product is meant to do:

1. Cleanse
2. Hydrate
3. Seal
4. Protect

If a product does not fit one of these roles, then don’t buy it.

For Low Porosity Hair

• Shampoo: Regular or clarifying formulas that remove build-up easily
• Conditioner: Lightweight, water-based conditioners, not thick creams
• Leave-in conditioner: Light lotions or sprays that absorb quickly
• Avoid: Heavy butters, thick oils, and excessive layering

Low porosity hair responds better to fewer, lighter products used correctly.

For High Porosity Hair

• Shampoo: Gentle, moisturising cleansers that do not strip
• Conditioner: Richer conditioners that add slip and softness
• Leave-in: Cream-based leave-ins followed by a light sealing oil or serum
• Support: Occasional protein products to reinforce weakened cuticles

High porosity hair needs products that slow moisture loss, not just add moisture.

Low vs High Porosity Hair in Singapore: What Causes It and Why It Matters

Understanding porosity explains why hair behaves the way it does in our climate. It shifts the focus from chasing trends to making smarter adjustments based on how your hair absorbs and holds moisture. 

Once the cause is clear, routines become simpler, more cost-effective, and far more consistent.

If you are choosing a hair product in Singapore, porosity should guide that decision.

At Top Secret, we curate and sell hair products that work across all hair types, with a strong focus on solutions for people dealing with porous hair. 

Regardless if your hair struggles to absorb moisture or loses it too quickly, we help match the right textures and formulas to how your hair actually behaves, not just how it looks on wash day.

Browse our range and build a routine that works with Singapore’s humidity, not against it.

Source:

• NYSCC – “An Overview on Hair Porosity” (11 Nov 2020) – New York Society of Cosmetic Chemists explainer on what hair porosity is, how cuticle structure and damage affect it, and how porosity influences product response.
  
• Healthline – “What Type of Hair Porosity Do You Have?” (22 Aug 2019) – Consumer-friendly breakdown of low, medium, and high porosity, basic tests, and care implications.
  
• Healthline – “Low Porosity Hair: Characteristics and Tips for Care” (12 Sept 2019) – Defines low porosity, notes tightly closed cuticles, slower wetting/drying, and challenges with product absorption and build-up.
  
• Health.com – “What Does It Mean To Have High Porosity Hair?” (2025) – Explains that high porosity can be natural (e.g., curly/coily, gray, light-coloured hair) or caused by chemical/heat damage, aging, or UV; describes fast absorption/fast moisture loss and relevant tests (spray, float, slide).
  
• Medical News Today – “Low porosity hair: What it is, characteristics, and care” (3 May 2022) – Summarises NYSCC findings; emphasises that low porosity hair is less absorbent, prone to surface product build-up, and often less breakage-prone.
  
• MDPI Cosmetics – “Porosity and Resistance of Textured Hair: Assessing Chemical and Physical Damage Under Consumer-Relevant Conditions” (Gasparin et al., 2025) – Peer-reviewed study showing how chemical and physical damage (including consumer-relevant washing/heat cycles) alter hair porosity and mechanical resistance.
  
• Byrdie – “How to Determine Your Hair Porosity, According to Pros” (updated 4 Apr 2024) – Cites NYSCC and “True porosity measurement of hair”; discusses practical porosity tests, including why float tests can be unreliable and how spray/behaviour tests work.
  
• Health.com – “What Does It Mean To Have Low Porosity Hair? Plus, Tips for Care” (2025) – Confirms low-porosity traits (tight cuticle, slower absorption) and recommends lightweight products, steam/heat, and build-up management.
  
• Healthline – “Hair Care Tips for High Porosity Hair” (19 Sept 2019) – Explains that high porosity hair absorbs water easily but struggles to retain it, plus care tips such as sealing and gentle cleansing.
  
• Mielle Organics Blog – “What is Hair Porosity?” (29 Jul 2022) – Brand edu-article repeating cosmetic-science basics: cuticle as overlapping shingles, more open cuticle = higher porosity; high porosity absorbs water quickly and dries fast.
  
• Color Wow / Pattern / other expert brand blogs on high porosity hair (2023–2025) – Used for cross-checking behaviour descriptions (fast wetting, fast drying, frizz, product “disappearing”) and practical care strategies. 

Frequently Asked Questions About Low vs High Porosity Hair in Singapore

What Is Hair Porosity In Simple Terms?

Hair porosity describes how easily your hair absorbs water and how well it retains that moisture after washing or conditioning.

Is Low Porosity Hair Better Than High Porosity Hair?

No. Neither is better; they simply behave differently and require different product choices and care methods to stay healthy.

Does Singapore’s Humidity Affect Hair Porosity?

Humidity does not change porosity, but it makes porosity-related issues more noticeable, especially frizz, build-up, and moisture loss.

Can Hair Porosity Change Over Time?

Yes. Heat styling, colouring, chemical treatments, and product habits can increase porosity over time, while proper care can improve how hair behaves.

Is The Float Test Accurate For Checking Hair Porosity?

Not on its own. It is easily affected by residue and water quality, so it should be used alongside drying time and absorption behaviour.

Do I Need To Change All My Products Once I Know My Porosity?

Not always. Many issues improve by adjusting product texture, order, and technique rather than replacing everything at once.