Porosity is the single most important factor in choosing the right products for your hair. Yet most people have never heard of it.
What is Porosity?
Porosity refers to your hair's ability to absorb and retain moisture. It's determined by the condition of your cuticle—the outer layer of each hair strand.
The Three Types
Low Porosity
The cuticle lies flat, making it difficult for moisture to enter. Water beads up on your hair. Products tend to sit on top rather than absorb. Good news: once moisture gets in, it stays.
Medium Porosity
The cuticle is slightly raised—the ideal state. Moisture enters and exits at a balanced rate. Products work effectively without much adjustment.
High Porosity
The cuticle is very raised or damaged, with gaps. Moisture enters easily but escapes just as fast. Hair dries quickly and often feels dry despite products.
The Float Test
Drop a clean, product-free strand into water. If it floats, you're low porosity. Sinks slowly? Medium. Sinks immediately? High porosity.
Product Recommendations
- Low porosity: Light products, heat to open cuticle, avoid heavy butters
- Medium porosity: Most products work, maintain with protein/moisture balance
- High porosity: Heavy creams and butters, protein treatments, sealants
Know Your Porosity?
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