Understanding porosity — the missing variable for textured hair
If you've ever bought a product everyone raved about and watched it sit on top of your hair like a coat of varnish, the answer probably isn't your curl type. It's your porosity — the most under-discussed variable in textured haircare.
What porosity actually is
Hair is built of three layers: the medulla (the core), the cortex (the strength layer), and the cuticle (the outer scales). The cuticle works like roof tiles: when they lie flat, water and product roll off. When they stand up, water pours in — and out — at speed.
Porosity is just a measure of how open those tiles sit:
- Low porosity — cuticle sealed tight. Water beads on the surface. Products sit on top, take forever to absorb. Hair feels soft once moisturised but takes ages to get there.
- Medium porosity — cuticle slightly raised. Hair absorbs and holds moisture predictably. The "easy" porosity if there is one.
- High porosity — cuticle open, often from heat, color, or chemical processing. Hair drinks anything you put on it but loses moisture just as fast. Often feels rough, frizzy, breakable.
The three-second porosity test
Pluck a clean (no product) shed strand and drop it into a glass of room-temperature water. Wait 3 minutes.
- Floats on top → low porosity.
- Floats halfway → medium.
- Sinks to the bottom → high porosity.
That's it. No need for a hairdresser appointment, no need for a $40 strand test kit. Three minutes, a glass, a strand.
Why porosity matters more than curl type for product selection
The classic 2A–4C curl chart tells you what your hair looks like. Porosity tells you what it does with what you put on it. A 4C strand with low porosity will reject a heavy butter that a 4C strand with high porosity will inhale. Same curl type, opposite needs.
This is the gap most US haircare brands miss. They sort by curl type and stop. We sort by what the hair actually wants to absorb.
Which RoseBaie gamme matches your porosity
Our four gammes were formulated with three porosity profiles in mind, not four curl types.
Low porosity → Aloe Vera × Keratin
Low-porosity hair wants permeants — small molecules that can sneak past tight cuticles. Our Aloe Vera line is the lightest in the catalogue: hydrolysed keratin sized to penetrate, plus aloe polysaccharides that soften without coating. Skip the heavy oils for now.
Medium porosity → Castor × Keratin or Coconut × Keratin
You have the most flexibility. Pick by goal: growth focus → Castor. Hydration focus → Coconut. Both layer keratin with their hero ingredient at concentrations medium-porosity hair handles well.
High porosity → B.otox bond repair + Coconut
High-porosity hair needs two things: structural repair (close those cuticles) and occlusion (lock moisture in). Our B.otox masks rebuild broken bonds inside the cortex; the Coconut Mask seals the cuticle on the way out. Used together for 4 weeks, this combination is what most of our 4C and post-bleach customers settle on.
Oily scalp + high-porosity lengths → Prickly Pear × Keratin
The most common imbalance — and the line we built specifically for it. Prickly pear extract regulates sebum at the root; the lengths-only mask delivers moisture without weighing the crown down.
What to do this week
- Run the strand test.
- Take the Hair Quiz — it factors in porosity signals (heat, color, scalp behaviour) and matches you to one of the four gammes.
- Buy one product from your matched gamme as a starter. Live with it for a week before committing to the full routine.
If you want a deeper dive into how each gamme is formulated, our Our Science page walks through the keratin × botanical architecture and the clinical results behind each line.
