Not all hair needs the same routine. The shampoo that leaves one person's hair soft and bouncy might leave another person's hair feeling coated, dry, or weighed down.
One of the best ways to understand what your hair needs is to learn about hair porosity.
Hair porosity describes how easily your hair absorbs and retains moisture. Once you understand whether you have low, medium, or high porosity hair, it becomes easier to choose the right shampoo, conditioner, hair oil, treatment, and hair mask.
This is particularly useful when exploring Korean, Japanese, and Chinese hair care, where you'll find a wide range of lightweight scalp treatments, hydrating shampoos, hair essences, nourishing oils, protein treatments, and intensive repair masks designed for different hair concerns.
Lightweight Korean hair care products are perfect for those with hair prone to buildup, while nourishing Japanese hair care products help with dry, damaged lengths, and innovative Chinese hair care products tend to everyday hair and scalp concerns. Understanding your hair porosity can help you build a routine that works with your hair, rather than against it.
What is hair porosity?
Hair porosity refers to your hair's ability to absorb and retain moisture and hair care ingredients.
It is influenced by the condition and structure of the hair cuticle, which is the outer layer of each strand.
There are three main hair porosity types:
- Low porosity hair: Hair has a relatively compact cuticle, so water and products may have difficulty penetrating the strand.
- Medium porosity hair: Hair generally absorbs and retains moisture well and tends to be relatively easy to manage.
- High porosity hair: Hair absorbs moisture quickly but can also lose moisture quickly, particularly when the cuticle has been damaged.
Your hair's porosity can also be affected by bleaching, colouring, chemical treatments, heat styling, and environmental damage.
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Why does hair porosity matter for Korean, Japanese, and Chinese hair care?
Korean, Japanese, and Chinese hair care offers a wide variety of formulas, from lightweight scalp shampoos and watery hair essences to rich repair masks, nourishing hair oils, and hair-refreshing products.
Knowing your hair porosity can help you decide which type of Korean, Japanese, or Chinese hair care product is likely to suit your hair best.
For example:
Low porosity hair may prefer lightweight Korean, Japanese, and Chinese hair care formulas that hydrate without creating heavy buildup.
Medium porosity hair generally benefits from a balanced hair care routine that maintains moisture without overloading the hair.
High porosity hair may benefit from richer Korean, Japanese, and Chinese hair care products containing conditioning, strengthening, protein, and oil-based ingredients.
There is no single "best" hair care routine. The right products depend on how your individual hair behaves, so use your hair porosity as a guide rather than a strict rule.
How to test your hair porosity
One popular at-home method is the hair porosity water test.
The hair porosity water test
- Take a clean strand of hair without styling products, oils, or heavy conditioner.
- Fill a glass with room-temperature water.
- Place the strand gently on the surface.
- Leave it for a few minutes and observe where it sits.
The traditional interpretation is:
Floats = low porosity
Your hair may resist absorbing water and products.
Hovers = medium porosity
Your hair generally absorbs and retains moisture well.
Sinks = high porosity
Your hair may absorb water quickly but lose moisture quickly too.
Is the hair porosity test accurate?
The water float test is best treated as a rough guide rather than a definitive scientific test. Hair thickness, product residue, oils, and surface tension can all affect whether a strand floats or sinks.
For a more useful assessment, pay attention to how your hair behaves during your normal Korean, Japanese, or Chinese hair care routine.
Does your hair take a long time to become completely wet?
Do products seem to sit on the surface?
Does your hair dry extremely quickly?
Does it absorb leave-in products almost immediately but still feel dry?
These everyday signs can tell you a lot about your hair's porosity.
Low Porosity Hair
What is low porosity hair?
Low porosity hair has a relatively compact cuticle, which can make it more difficult for water and hair care products to penetrate the strand.
Common signs of low porosity hair include:
- Products tend to sit on the hair
- Hair can become weighed down easily
- Product buildup can be a concern
- Hair may take longer to become fully wet
- Lightweight formulas tend to work well
What does low porosity hair need?
Low porosity hair generally benefits from lightweight, watery, and easily absorbed formulas.
Rather than automatically choosing the richest product available, look for lightweight shampoos, hair essences, leave-in treatments, and conditioners that provide hydration without leaving a heavy coating.
Korean and Japanese hair care for low porosity hair
VT Reedle Shot Hair Boosting Scaling Shampoo
This Korean hair care pick combines scalp cleansing with a micro-needle-inspired approach. It helps remove buildup while supporting a clean, refreshed scalp, making it a useful option when hair feels weighed down by product residue.
Julyme Perfume Glow Milk Hair Essence
This lightweight Korean hair essence has a milky lotion texture designed to hydrate frizzy strands without the heavy feel of rich waxes or butters. It absorbs quickly, making it a useful option for low porosity hair that doesn't respond well to heavy leave-in products.
Medium Porosity Hair
What is medium porosity hair?
Medium porosity hair generally absorbs and retains moisture relatively well.
The cuticle allows hydration to enter without allowing it to escape too quickly, which can make this hair type relatively easy to manage.
Common characteristics include:
- Hair absorbs moisture relatively easily
- Hair generally retains hydration well
- Products don't tend to sit excessively on the surface
- Hair is usually manageable
- Hair can still become dry or damaged with excessive heat or chemical processing
What does medium porosity hair need?
Medium porosity hair benefits from balanced hair care.
The goal is to maintain hydration while avoiding excessive product buildup. A combination of gentle cleansing, conditioning, occasional treatments, and a suitable hair oil can help maintain the hair's natural moisture balance.
Korean and Japanese hair care for medium porosity hair
Diane Extra Fresh & Hydrate Shampoo
This Japanese hair care shampoo helps cleanse away sebum and dirt while maintaining moisture. Its fresh, lightweight approach is designed to leave hair feeling clean and airy rather than overly stripped.
&honey Deep Moist Hair Oil
This Japanese hair oil provides deeper moisture while helping smooth flyaways and enhance shine. It can be used to help maintain softer, more conditioned-looking lengths without needing to layer multiple heavy products.
High Porosity Hair
What is high porosity hair?
High porosity hair has a more open or raised cuticle structure, meaning it can absorb moisture quickly but may also lose it quickly.
High porosity hair is often associated with hair that has experienced bleaching, colouring, chemical treatments, frequent heat styling, or other forms of damage.
Common signs include:
- Hair becomes wet quickly
- Hair dries quickly
- Frizz is common
- Ends feel dry or rough
- Hair tangles easily
- Hair absorbs products quickly
- Hair struggles to retain moisture
- Breakage may be more noticeable
What does high porosity hair need?
High porosity hair can benefit from richer conditioning formulas, strengthening ingredients, proteins, oils, and treatments designed to smooth and protect the hair fibre.
The goal isn't simply to add more moisture. High porosity hair also needs products that help it retain moisture and maintain the appearance and feel of stronger, smoother hair.
Korean, Japanese, and Chinese hair care for high porosity hair
Dr.Melaxin Bondex Protein Bonding Remodeling Shampoo
This Korean hair care shampoo is designed for severely damaged, fragile, and over-processed hair. Its protein-focused approach targets the appearance of weakened hair, while argan oil helps condition and protect the hair shaft.
Botanist Botanical Hair Mask Deep Damage Repair Balm
This Japanese hair care mask has a rich balm texture designed for dry and damaged hair. Its intensive conditioning formula makes it particularly suited to coloured, chemically treated, or heat-damaged hair that needs richer care.
What about Chinese hair care?
Chinese hair care, or C-beauty hair care, is also gaining attention for innovative products designed around everyday hair and scalp concerns.
While not every Chinese hair care product is specifically designed for a particular hair porosity, there are products that can complement different routines depending on your hair's needs.
For example, SPES Dry Shampoo has become a viral Chinese hair care product for refreshing oily roots and absorbing excess oil between washes. It can be useful when scalp oil is your main concern, particularly on days when you want to extend the time between hair washes.
It's important to remember that dry shampoo addresses scalp oil and hair freshness rather than hair porosity. For dry, porous lengths, you'll still want to use appropriate conditioning products, hair masks, oils, or leave-in treatments based on your hair's needs.
Can you combine Korean, Japanese, and Chinese hair care?
Absolutely. Your hair-care routine doesn't need to come from a single country.
You can combine Korean, Japanese, and Chinese hair care products according to your hair's porosity, scalp condition, and specific concerns.
For example:
- Low porosity hair: Lightweight Korean, Japanese, or Chinese formulas can help provide hydration without excessive buildup.
- Medium porosity hair: A balanced combination of cleansing, hydration, and conditioning products can help maintain moisture.
- High porosity hair: Richer Korean, Japanese, or Chinese hair care products can provide conditioning, strengthening, and moisture retention.
- Oily scalp: Scalp-focused products or Chinese dry shampoo such as SPES can help refresh the roots between washes.
- Dry or damaged lengths: Japanese hair oils, rich masks, and Korean strengthening treatments can provide more intensive care.
The best routine is not necessarily determined by whether a product is Korean, Japanese, or Chinese. Your hair's porosity and condition should guide your product choices.
