Porosity and moisture balance for curly hair – how to find the right one
Hair porosity determines how easily it absorbs and retains moisture. Low porosity needs lightweight products and heat to open the cuticle layer, while high porosity needs richer treatments that smooth the open cuticle layer. Always rinse with cool water to close the cuticle layer and lock in moisture.
Do you know your hair’s porosity? It is one of the most underrated factors in hair care, and for curly hair it is the difference between products that sink in and provide moisture and products that simply sit on the surface. Porosity refers to how open or closed the cuticle layer is, and it affects everything from how you wash your hair to which conditioner bar for curly hair actually works for you.
What is hair porosity?
The cuticle layer is the outermost layer of the hair shaft, made up of overlapping scales like roof tiles. Porosity describes how tightly or openly these scales lie:
- Low porosity: Tightly closed scales. The hair takes a long time to get wet and absorbs products slowly. Moisture stays in for a long time once it has entered.
- Medium porosity: Balanced. The hair absorbs and retains moisture without difficulty. Most products work well.
- High porosity: Open or damaged scales. The hair gets wet quickly but loses moisture just as fast. Common in chemically treated, bleached, or heat-damaged hair.
How do you test your porosity?
The float test: Place a clean, dry strand of hair in a glass of water. Does it float for a long time? Low porosity. Does it sink quickly? High porosity.
The feel test: Run your fingers upward along a strand of hair, against the direction of hair growth. Does it feel uneven and rough? High porosity. Smooth? Low porosity.
Moisture balance: more than just conditioner
Moisture balance for curly hair is about finding the right balance between moisture and protein. Too much moisture without protein results in soft but lifeless hair without definition. Too much protein without moisture results in stiff, brittle hair that breaks easily. Read more about protein and moisture balance in hair to understand what your hair needs and when.
Choosing products based on porosity
Low porosity: Choose lightweight, moisturizing products. The DREAMY hair conditioner bar works excellently; apply it to wet hair and use a warm shower cap to open the cuticle layer and allow glycerin and coconut oil to penetrate. Rinse thoroughly with cool water afterward.
High porosity: Choose conditioning products and leave them on for longer. Using DREAMY hair as an overnight hair treatment is especially effective; cetearyl alcohol and coconut oil smooth the open cuticle layer, while lactic acid closes the cuticle layer when you rinse with cool water.
Ocean Waves shampoo bar cleanses gently with Sodium Cocoyl Isethionate and lactic acid, which regulates pH—a good foundation for all curl types.
Porosity is not a problem to solve; it is a language to learn.
Quick guide: choosing products based on porosity
| Porosity | Product type | Tips for the DREAMY conditioner bar |
|---|---|---|
| Low | Lightweight, water-based | Apply to wet hair + use a warm shower cap |
| Medium | Most products work | 3–5 minutes in the shower is enough |
| High | Rich conditioners, treatments | Use as a treatment for 20–30 minutes |
Read more in our complete guide to curly hair.