Key Takeaway
The heart of healthy hair care begins with understanding Hair Porosity, which determines the hair’s ability to absorb and retain moisture through the arrangement of the hair cuticles. Porosity is divided into 3 levels: low porosity where the cuticles are tightly closed making it difficult for nutrients to enter, normal porosity which is the most balanced, and high porosity where the cuticles are damaged until the hair becomes dry, brittle, and breaks easily. You can perform a simple test using the Float Test method or by observing how a hair strand sinks in water to help identify your own porosity level. This allows you to choose a targeted treatment, such as using heat to help open the cuticles for those with low porosity or using oil to lock in moisture for those with high porosity. This will help solve damaged hair problems sustainably and reduce the risk of hair thinning in the future
One of the most common hair concerns is using treatment after treatment without seeing noticeable results, while the hair still feels dry and damaged despite expensive products. In many cases, the issue is not only the product itself but also the fact that each person has a different level of hair porosity.
This article will walk you through what hair porosity is, the three levels of hair porosity, and how to do a simple at-home hair porosity test so you can choose the most suitable care routine with greater accuracy. It also helps explain low vs high porosity hair and why the difference matters when choosing products and daily care methods.
What Is Hair Porosity?
Hair porosity refers to the hair’s ability to absorb and retain moisture. The main factor that determines porosity is the cuticle, the outermost layer of the hair shaft, which is made up of overlapping scales.
If the cuticle structure is not functioning properly, whether it is too tightly closed or too widely open, it directly affects the health of the hair and how well it responds to conditioners, oils, and other nourishing products.
The 3 Levels of Hair Porosity
Low Porosity Hair
What is low-porosity hair? In this group, the hair cuticles are bound very tightly together.
- Characteristics: Water and treatments have a hard time penetrating the hair shaft. Products often sit on the surface of the hair rather than being absorbed.
- Observation: It takes a long time for the hair to get fully wet and an even longer time to blow-dry completely.
Medium Porosity Hair
This is the most balanced and healthiest state. The cuticles are spaced just right.
- Characteristics: It absorbs moisture easily and retains it for a long time. The hair typically has good volume, shine, and is easy to style.
- Observation: Hair gets wet and dries in a reasonable amount of time. Chemical treatments like coloring or perming yield consistent results.
High Porosity Hair
The cuticles are damaged, raised, or have numerous gaps. This is often caused by external factors like heat, hair dye chemicals, or genetics.
- Characteristics: The hair absorbs water very quickly but loses it just as fast through evaporation.
- Observation: Hair is often dry, brittle, frizzy, tangles easily, and is at a higher risk of breakage than usual.
How to Test Hair Porosity at Home with the Float Test
You can do a basic hair porosity test at home using clean water by following these steps:
- Fill a clear glass with room-temperature water.
- Take 1-2 strands of hair that have shed naturally. Ensure they are clean and free of any hair products.
- Place the hair on the surface of the water. Let it sit for 2 to 5 minutes and observe.
Test Results
- If the hair floats on the surface, it has low porosity, meaning the cuticle is tightly closed.
- If the hair slowly sinks and stays in the middle of the glass, it has normal or medium porosity, which generally indicates healthy hair.
- If the hair sinks straight to the bottom, it has high porosity, meaning it contains many gaps and needs restorative care.
Hair Care Tips Based on Porosity Levels
- For low-porosity hair, gentle heat can help during treatment, such as steam therapy or wrapping the hair with a warm towel while applying a hair mask. This can help open the cuticle slightly so the hair is better able to absorb nourishment. Lightweight products are usually the best choice for this group.
- For high-porosity hair, it is best to avoid washing with very hot water. Hair oils can help seal in moisture so it does not evaporate too quickly through the gaps in the cuticle. Protein-based products may also help fill in those gaps and improve the strength and feel of the hair.
When Hair Porosity Contributes to Thinning and Shedding
Hair porosity is not just about outward appearance. If hair remains highly porous for a long time without proper care, it becomes weaker and more likely to snap in the middle of the strand. Over time, this may lead to visible thinning and affect confidence.
Proper hair and scalp care from an early stage is therefore very important. If your hair starts thinning to the point where the scalp becomes more visible, or if regular hair care no longer helps restore strength, consulting an expert physician for a deeper diagnosis can be a more effective solution.
Max Hair Clinic is a leading hair transplant clinic in Thailand. We are ready to provide consultations and hair analysis using modern technology to design treatment plans that strengthen hair from the root, helping it return to a naturally thick and healthy state.
Book an appointment for a hair and scalp analysis, a treatment assessment, or a pricing consultation at Max Hair Clinic, the premier destination for hair transplant in Bangkok. Regain your thick, natural-looking hair with our trusted experts. Contact any branch at Tel: 083-289-1664 LINE: @MAXHAIR
References :
- What Type of Hair Porosity Do You Have?. Retrieved March 4, 2026, from https://www.healthline.com/health/hair-porosity
