Hair Education
Understanding Hair Porosity
Hair porosity describes how well your hair absorbs and holds moisture. It depends on the condition of the hair’s outer layer, called the cuticle, which controls how easily water and products move into and out of the strand. Porosity is commonly grouped into three categories: low, medium, and high. Knowing your porosity can help you choose routines and products that keep your hair balanced and healthy.
Hair Porosity Test
Over the years, the float test has become popular as a way to identify hair porosity. To try it, place a clean strand of shed hair into a glass of water and observe how it behaves after a few minutes. If the strand floats, it may suggest low porosity, while hair that stays suspended or sinks may indicate medium or higher porosity.
However, experts note that the float test should only be used as a rough starting point, not a definitive diagnosis of porosity. Hair that sinks quickly may not always indicate naturally high porosity—it can also happen if the hair strand is damaged, coated with product buildup, or affected by oils or residues, which can change how the strand interacts with water.
Because of this, dermatology and hair-science sources recommend considering multiple signs of porosity, such as how quickly hair absorbs water, how long it takes to dry, and how well it retains moisture over time. Looking at these patterns alongside simple tests like the float test can provide a more accurate understanding of your hair’s porosity.
Let Moisture In
Low porosity hair benefits from routines that help moisture penetrate the tightly sealed cuticle while avoiding product buildup. Lightweight products and applying products to damp hair can help improve absorption, while gentle cleansing helps remove residue that may sit on the hair’s surface.
Low Porosity Hair Routine tips
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Apply products to damp hair to help moisture enter the hair shaft more easily.
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Use lightweight, water-based products rather than heavy oils that may sit on the surface of the hair.
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Cleanse the hair regularly to remove buildup that can prevent moisture from absorbing.
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When deep conditioning, apply heat (hooded dryer, warm towel, etc) to raise the cuticle a little and let the moisture in.
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Avoid layering too many products, which can build up on low porosity hair.
Low Porosity Hair
Low porosity hair has tightly packed cuticles, which makes it harder for water and products to enter the hair shaft. Because of this structure, hair may take longer to become fully wet during washing and may also take longer to dry once saturated. Products can sometimes sit on the surface of the hair instead of absorbing quickly, especially if they are heavy or oil-based.
People with low porosity hair may notice that moisture takes effort to add, but once it penetrates the strand, the hair can retain that moisture for a longer period of time.
Maintain the Balance
Medium porosity hair generally benefits from balanced routines that maintain moisture while preventing buildup or damage. Regular cleansing, conditioning, and gentle handling help maintain healthy hair and preserve the cuticle structure.
Best Routine Tips
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Medium Porosity Hair
Medium porosity hair has a balanced cuticle structure, meaning moisture can move into and out of the hair shaft more easily. Because of this balance, hair usually absorbs water and hair products without difficulty and also retains moisture well.
This type of hair often responds well to most hair care routines, making it easier to maintain and style compared with low or high porosity hair.
Lock in Moisture
High porosity hair benefits from routines that focus on restoring and retaining moisture while protecting the hair from further damage. Conditioning regularly and using products that help seal moisture into the hair can help improve softness and manageability.
Hight Porosity Hair Routine Tips
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Use conditioner regularly to help maintain moisture in the hair.
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Apply moisturizing products to help reduce dryness and frizz.
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Detangle hair gently, especially when hair is wet, to prevent breakage.
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Limit excessive heat styling or chemical treatments, which can damage the hair cuticle.
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Handle hair gently during styling to reduce stress on fragile strands.
High Porosity Hair
High porosity hair has raised or damaged cuticles, which allow moisture to enter the hair shaft easily but also escape quickly. Because of this, hair may absorb water very quickly during washing, but it may also dry faster and lose moisture more easily than other porosity types.
High porosity hair may also be more prone to dryness, frizz, and breakage, since the cuticle structure does not retain moisture as effectively.