How to Determine Your Hair Porosity and Why it Matters

Have you ever bought a highly-rated hair product, applied it, and felt like it just sat on top of your strands like a heavy grease layer? Or perhaps you wash your hair, only to notice it dries almost instantly, leaving it feeling brittle and straw-like? These behaviors are determined by your **hair porosity**.

Understanding your curl pattern (Type 2, 3, or 4) is helpful for styling, but knowing your hair porosity is essential for **moisture retention**. Once you understand your porosity type, you can tailor your cleansing, conditioning, and styling products to work with your hair's biology.

What is Hair Porosity?

Hair porosity refers to your hair cuticle's ability to absorb and retain moisture. Cuticles are microscopic, overlapping scales that cover the surface of your hair shafts. Based on how tightly these scales lie, porosity is categorized into three levels:

• Low Porosity: Cuticle scales are tightly bound and overlap like shingles on a roof. It is very hard for water or oils to enter the hair shaft, but once inside, moisture is locked in tight.
• Medium Porosity: Cuticle scales are slightly raised and balanced. Hair absorbs moisture easily and holds it for a reasonable duration. This is the easiest type to manage.
• High Porosity: Cuticle scales are raised, chipped, or have gaps (often due to chemical processing, bleaching, or heat damage). Moisture enters the strand instantly, but evaporates just as fast, leaving hair perpetually dry.

The Easy Float Test: How to Determine Your Porosity

You can identify your hair porosity at home using a clean glass of water:

1. Wash your hair with a clarifying shampoo to remove all product buildup, and let it dry completely.
2. Take a single shed strand of hair and place it gently onto the surface of a glass of room-temperature water.
3. Monitor the strand for 5 minutes:
- If the hair floats on top of the water: You have Low Porosity.
- If the hair floats in the middle: You have Medium Porosity.
- If the hair sinks to the bottom: You have High Porosity.

Caring for Low Porosity Hair

Because the cuticle scales are closed shut, low porosity hair is prone to product buildup. Follow these care rules:

• Use heat to open cuticles: Apply deep conditioners under a plastic cap combined with a warm bonnet or hair steamer. The warmth raises the cuticle scales, allowing ingredients to enter.
• Choose lightweight, water-based products: Look for humectants like glycerin, aloe vera, and honey. Avoid heavy oils (like castor oil or coconut oil) which will only sit on top of the hair.
• Prefer the LCO Method: Layer products as Liquid (water/leave-in), Cream (moisture), and then Oil (light oil like jojoba to seal).

Caring for High Porosity Hair

Because the cuticles are open, high porosity hair needs heavy, structural lipids to patch up the gaps in the cuticle scales:

• Incorporate proteins: High porosity benefit from hydrolyzed proteins (keratin, silk, or wheat proteins) which bind to the gaps in the shaft to restore strength.
• Seal with heavy creams and butters: Use thick emollients like Shea Butter, Avocado Oil, or Castor Oil to create a protective, water-impermeable layer on the shaft.
• Prefer the LOC Method: Layer products as Liquid (water), Oil (heavy oil to fill gaps), and Cream (thick butter to seal cuticles).

Conclusion

There is no "bad" porosity type. Whether your cuticle scales are tightly closed or wide open, the secret to healthy, hydrated hair is choosing products that match your hair's permeability. Conduct the float test today and adjust your layering order to achieve soft, defined, and bouncy locks.