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High porosity hair has gaps and holes in the cuticle, which allow too much moisture into your hair and releases moisture quickly. It is the result of chemical, mechanical, or heat damage.

Color treating your hair requires that the hair’s cuticle be lifted in order to alter the melanin in the strands, and even though the cuticle is closed after the hair is rinsed and conditioned, the damage is already done. When your hair breaks easily with minimal effort, it is a sign of improper protein and moisture balance, so this will require incorporating protein-rich products into your regimen.

Soggy and limp strands that hyperextend while wet are evidence of worn elasticity. This occurs when there is damage to the cortex, which cannot happen unless there is damage to the cuticle as well. Using heat styling tools too frequently also damages the cortex by melting the keratin in the hair and chipping the cuticle.

Style your hair however you want, but know the risks and how to take care of your hair accordingly.

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Hair with medium porosity often requires the least amount of maintenance. The cuticle layer is looser than low porosity hair, allowing just the right amount of moisture to enter while preventing too much from escaping.

Hair with normal porosity tends to hold styles well and can be relaxed and colored with predictable results. Over time, however, these processes can damage your hair and increase its porosity, making it more porous. This occurs as you retain length, style, and regular maintenance, which is why trims are important.

Occasional deep conditioning treatments with protein conditioners can benefit medium porosity hair, but proteins should not be included in your daily regimen. Remember to keep your ends trimmed to prevent your hair from becoming highly porous as you retain length.
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Hair with low porosity has a tightly bound cuticle layer with overlapping scales that lay flat. It repels moisture when you try to wet it and is hard to process since it resists penetration of chemicals. Low porosity hair is also prone to build up from protein-rich products, which can leave the hair feeling stiff and straw-like.

Stick to protein-free, daily conditioners with humectants such as glycerin or honey. Use moderate heat with protein-free deep conditioning treatments to help open up the tightly bound cuticle. Trim when necessary to prevent your hair from becoming highly porous as you retain length.
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