Introduction
Hair porosity is one of the most talked-about topics in natural hair care — and one of the most misunderstood. Once you truly understand your hair's porosity, product selection becomes dramatically easier and your results improve almost immediately. Here's your complete guide.
What Is Hair Porosity?
Porosity refers to your hair's ability to absorb and retain moisture. Think of your hair shaft as having tiny scales (called the cuticle layer). When these scales are raised, open, or damaged, water gets in easily — but also escapes quickly. When the cuticle is flat and tight, it's harder for moisture to enter — but once it does, it tends to stay.
The Three Types of Hair Porosity
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Low Porosity: The cuticle lies very flat and tightly packed. Moisture struggles to enter the hair shaft. Products tend to sit on top of the hair rather than absorbing. Low-porosity hair is prone to product buildup.
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Medium (Normal) Porosity: The cuticle is slightly raised, allowing moisture to enter and exit at a balanced rate. This is the easiest porosity to work with and maintain.
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High Porosity: The cuticle has gaps, damage, or is chronically raised. Moisture enters quickly but escapes just as fast. High-porosity hair often feels dry very soon after moisturizing and is more prone to frizz.
How to Test Your Porosity
The float test: drop a clean strand of hair into a glass of room-temperature water. Low porosity hair floats on top (the cuticle repels water). Medium porosity hair floats in the middle. High porosity hair sinks quickly (absorbs water fast). Note: product buildup can affect results, so test on clean hair.
How to Care for Low Porosity Hair
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Use heat to open the cuticle during deep conditioning
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Apply products to damp (not soaking wet) hair to help absorption
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Avoid heavy butters and oils that sit on top of the hair
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Use lighter, water-based moisturizers
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Clarify regularly to prevent buildup
How to Care for High Porosity Hair
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Use cold water rinses to close the cuticle after washing
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Layer products using the LCO or LOC method to trap moisture
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Use heavier butters and oils as sealants
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Incorporate protein treatments to fill gaps in the cuticle
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Avoid excessive heat and chemical processing