If Moisture Escapes Your Hair, Which Hair Type Is Most Prone?
You deep condition, you use the best products, you drink your water, and yet your hair still feels dry by the end of the day. Sound familiar? The culprit might not be what you're putting in your hair, but how well your hair is actually holding onto it. This comes down to one key concept: hair porosity.
What Is Hair Porosity?
Hair porosity refers to your hair's ability to absorb and retain moisture. It's determined by the condition of your hair cuticle, the outermost layer of each strand. Think of the cuticle like roof shingles: when they lie flat and tight, moisture stays in. When they're raised or damaged, moisture slips right out.
There are three porosity levels:
- Low porosity: Cuticles are tightly closed. Moisture has a hard time getting in, but once it does, it stays.
- Medium (normal) porosity: Cuticles are slightly raised. Moisture absorbs and retains well with minimal effort.
- High porosity: Cuticles are raised or have gaps. Moisture absorbs quickly but escapes just as fast.
Which Hair Type Loses Moisture the Fastest?
High porosity hair is the most prone to moisture loss, and it's more common than you might think. It can be genetic, but it's also frequently caused by:
- Chemical processing (colour, relaxers, perms)
- Excessive heat styling
- Environmental damage (sun, wind, chlorine)
- Mechanical damage from rough handling
Curly and coily hair textures are also naturally more prone to dryness because the twists and bends of the hair shaft make it harder for the scalp's natural oils to travel down the strand. When you combine a curly or coily texture with high porosity, moisture retention becomes a real challenge.
How to Tell If You Have High Porosity Hair
A few signs to look for:
- Your hair dries very quickly after washing
- It absorbs product fast but still feels dry
- It tangles easily and feels rough or brittle
- It's prone to frizz in humid conditions
You can also try the float test: drop a clean strand of hair into a glass of water. If it sinks quickly, you likely have high porosity hair.
How to Lock Moisture In
The key for high porosity hair is sealing. After applying a moisturizing product, you need something to close the cuticle and trap that hydration inside. Here's a simple approach:
- Use lukewarm or cool water when rinsing to help close the cuticle.
- Apply a leave-in conditioner to damp hair immediately after washing. THICK Leave-In is formulated with botanical ingredients that help smooth the cuticle and deliver lasting moisture without buildup.
- Seal with an oil or butter on top of your leave-in to create a barrier that slows moisture evaporation.
- Avoid excessive heat, which further lifts the cuticle and accelerates moisture loss.
The Takeaway
If your hair seems to drink up moisture and then lose it just as quickly, high porosity is likely the reason. Understanding your hair's porosity is the first step to building a routine that actually works, one that gets moisture in and keeps it there.