Hair Wellness Lab
Crown Analysis · Porosity
In just 2 minutes, find out whether your hair is low, medium, or high porosity — and walk away with a personalized hair routine built for exactly how your strands absorb and hold moisture.
Crown Lab · Available to all members
Step-by-Step
The most common way people learn how to test hair porosity is the float test: drop a clean, freshly washed strand of hair into a glass of water, wait 2–4 minutes, and watch what happens. If the strand floats, the assumption is low porosity. If it sinks slowly, medium. If it sinks fast, high porosity.
The problem: the float test is unreliable. Surface tension can keep almost any clean strand floating, leftover product or oil affects whether it sinks, and a single shed strand rarely represents your whole head. That's why most stylists and trichology educators no longer recommend it as a stand-alone porosity test.
A better approach is a behavior-based hair porosity quiz. Instead of relying on one strand in a glass, it asks how your hair actually behaves — how fast it absorbs water, how long it takes to dry, how it reacts to humidity, and how long moisture lasts between wash days. That's exactly how the Hair Wellness Lab Hair Porosity Test works.
The Foundation
Hair porosity describes how easily your hair absorbs and retains moisture. It's determined by the state of your cuticle — the outermost layer of each strand — and it shapes almost every part of your crown care routine, which is exactly why a Hair Porosity Test is the smartest first step in any natural hair journey.
Getting your porosity right means your products actually work. It means your moisture lasts. It means you stop guessing — and start building a routine that genuinely fits your strands.
The Core Insight
“Building a routine without knowing your porosity is like following directions without knowing your starting point.”
Porosity Types
Not sure which one is yours? Find out in 2 minutes.
Start My 2-Minute Hair Porosity Test→Quick Comparison
Water sits on hair
Products don't absorb easily
Hair takes long to dry
Hair dries quickly
Moisture doesn't last
Hair feels dry or frizzy often
What to Look For
Why It Matters
Porosity isn't just a detail — it determines which products work, how long moisture lasts, and what a realistic maintenance schedule looks like for your specific crown.
Know Your Signs
Low porosity hair has tightly packed cuticles that resist moisture entry. Water and products tend to sit on the surface rather than absorbing into the strand.
Water sits on your hair and takes a long time to fully absorb
Products feel like they stay on top of your strands rather than soaking in
Your hair takes a long time to get fully wet in the shower
Hair takes a long time to dry after washing
Product buildup happens quickly even with lightweight formulas
Deep conditioners don't seem to make a noticeable difference
Low porosity isn't problem hair — it just needs a more intentional approach to hydration, including lightweight products and indirect heat during deep conditioning.
High porosity hair has open or raised cuticles that absorb moisture quickly — but often release it just as fast, leaving strands feeling dry again soon after washing or moisturizing.
Hair dries very quickly after washing — often faster than expected
Moisture seems to disappear fast, even after conditioning
Hair gets frizzy easily, especially in humid weather
Hair feels dry again soon after moisturizing
Strands absorb product almost immediately but still feel thirsty
Breakage may occur more easily, particularly on older or chemically processed lengths
High porosity hair thrives with a strong sealing strategy — layered moisture routines and heavier oils or butters help lock hydration in longer.
Common Questions
Hair porosity is how easily your hair absorbs and retains moisture. It is controlled by your cuticle — the outer layer of each strand. Low porosity hair has tightly packed cuticles that resist moisture entry, medium porosity hair has a balanced cuticle structure that absorbs and holds moisture well, and high porosity hair has open or raised cuticles that absorb water quickly but lose it just as fast.
The most accurate way to test your hair porosity is to take a behavior-based hair porosity quiz that asks how your hair acts on wash day, in humidity, and between moisture sessions. The popular float test — dropping a clean strand into a glass of water — is unreliable because surface tension, hair density, and product residue all skew the result. Our free 2-minute Hair Porosity Test uses how your hair actually behaves to give you a far more accurate answer than the float test alone.
No, the float test is not considered accurate. A clean strand of hair has natural surface tension that can keep it floating regardless of porosity, and any leftover product, oil, or buildup will affect whether it sinks or floats. Stylists and trichology experts recommend assessing your porosity by how your hair behaves — how fast it absorbs water, how long it stays wet, how quickly it loses moisture — rather than by a single float test in a glass of water.
If your hair is not retaining moisture, you most likely have high porosity hair, or you are using products that do not match your porosity type. High porosity strands have open cuticles that release moisture as fast as they absorb it, so they need a layered moisture routine plus a sealing step (a butter or oil) to lock hydration in. Low porosity hair can also feel dry when products sit on top of the strand instead of absorbing — switching to lightweight, water-based products and using indirect heat during deep conditioning often solves it.
Common signs of low porosity hair include products sitting on top of your hair rather than being absorbed, hair taking a long time to fully saturate with water, product buildup occurring quickly, and hair feeling coated or heavy after applying conditioners. Low porosity hair often benefits from lightweight products, consistent hydration techniques, and indirect heat during deep conditioning.
Yes, hair porosity can shift over time due to chemical treatments, heat use, environmental exposure, and changes in overall hair health. Hair that has been color-treated, bleached, or frequently heat-styled often becomes higher porosity over time. The porosity of your new growth may also differ from older, more processed lengths.
Not always. High porosity can be natural — some people are born with it — or it can result from damage caused by heat, chemical treatments, or mechanical stress. Naturally high porosity hair simply has a more open cuticle structure. Understanding your porosity helps you build a routine that accounts for how your hair absorbs and holds moisture, rather than treating porosity itself as a problem.
Porosity shapes almost every part of your routine — how often you need to moisturize, which products will actually absorb versus just sit on your hair, how long your wash day takes, and which sealing methods work best. Building a routine around your actual porosity type is one of the most effective ways to improve moisture retention, reduce breakage, and support long-term crown wellness.
Low porosity hair tends to respond well to lightweight, water-based products that can penetrate the tightly closed cuticle more easily. Humectants like aloe vera and glycerin can help draw moisture in. Heavier butters and thick oils are often better used sparingly on the ends rather than applied to the scalp or mid-shaft, where they may cause buildup without delivering moisture.
While you can build a general routine without knowing your porosity, understanding it significantly improves how well that routine works for you. Porosity tells you how your hair will interact with moisture and products — which means your routine becomes more intentional, more targeted, and more effective when it's built around your actual porosity type rather than general guidelines.
Explore More
Porosity is just one signal. Discover your full CrownPrint™ — beyond curl type.
Hair Wellness Lab provides educational hair wellness guidance based on your profile and available data. Content on this page is for informational purposes only and does not constitute medical advice. View full disclaimer.