Low vs. High Porosity Hair: What it actually means (and how to care for yours)

Let’s be real, hair care advice can feel overwhelming. One minute someone’s telling you to do a rice water rinse, the next it’s all about oils, deep conditioners, or some miracle product that costs half your pay check. But here’s the thing: the way your hair absorbs and holds moisture, a.k.a. your hair porosity, is one of the biggest clues to what your hair actually needs.

So, let’s break it down without the science textbook vibes.

What Is Hair Porosity?

Think of your hair like a sponge. Some sponges soak up water fast, while others take a while but hold onto it better. Porosity is basically how easily your hair absorbs and retains moisture.

There are three main types:

Low porosity: Your hair cuticles (the outer layer) are super tight and flat. Water and products have a hard time getting in—but once moisture does get in, it sticks around.

Medium/normal porosity: The cuticles are “just right”—not too tight, not too open. Your hair absorbs and holds moisture pretty well.

High porosity: The cuticles are more open, often from genetics or damage (like heat or bleach). Your hair drinks up moisture quickly but loses it just as fast.

How to Tell Which One You Have

Here are a couple of quick tests:

The Float Test: Drop a clean strand of hair in a glass of water.

If it floats = low porosity

If it sinks slowly = medium porosity

If it sinks quickly = high porosity

The Spray Test: Spray a little water on dry hair.

If the water beads up = low porosity

If it soaks in slowly = medium porosity

If it soaks in instantly = high porosity

Caring for Low Porosity Hair

Low porosity hair can be a little stubborn—it doesn’t like to let moisture in. But once you figure out how to “open the door,” your hair will thrive.

Tips:

Use lightweight products (too much heavy cream or oil can just sit on your hair).

Try a little heat when deep conditioning—like a warm towel or a steamer—to help open up your cuticles.

Clarify every so often to remove buildup (since products don’t absorb easily).

Caring for High Porosity Hair

High porosity hair is like a leaky bucket—it soaks everything up but struggles to keep it in. The goal is to seal and protect.

Tips:

Use rich, creamy moisturizers and oils to lock in hydration.

Layer products (the “LOC method”: Liquid → Oil → Cream).

Minimize heat and chemical damage, since your hair is already delicate.

Seal with heavier oils or butters to slow down moisture loss.

Caring for Medium Porosity Hair

Congrats, you’ve got the “easygoing” hair type. It usually does well with a balanced routine.

Tips:

Alternate between moisturizing and strengthening treatments.

Don’t overload with protein unless your hair feels weak.

Stick to a simple routine—you don’t need to overcomplicate it.

Final Thoughts

At the end of the day, knowing your hair porosity is like getting the cheat code for your hair care routine. It helps you stop wasting money on products that don’t work for you and finally give your hair exactly what it needs.

Remember: no matter your porosity, the most important thing is consistency. Once you find what works, stick with it—and your hair will thank you.