If you've been seeing the term "low porosity hair" everywhere lately and you're not totally sure what it means, you're not alone. It's one of the most searched hair terms right now, and most explanations either skip the basics or bury them under technical language.
So here's the plain-English version.
What porosity actually means
Porosity is just a way of describing how easily your hair lets moisture in and out. That's it. Every strand of hair has a cuticle layer, the outermost layer that protects it, and that cuticle can sit tighter or looser depending on your hair type.
- Low porosity means the cuticle sits tight and close together. Moisture has a harder time getting in, and once it's in, it tends to stay.
- High porosity means the cuticle sits looser or more raised. Moisture gets in easily, but it also escapes easily.
Neither one is better or worse. They just need different things.
What low porosity hair means for you, specifically
If you have low porosity hair, here's what that usually looks like day to day:
- Products tend to sit on top of your hair instead of soaking in
- Water can bead up on your strands in the shower instead of absorbing right away
- Your hair takes a long time to dry, sometimes way longer than it feels like it should
- Heavy products and butters tend to leave you feeling coated rather than moisturized
- Your hair can feel dry even when you're using "moisturizing" products consistently
If a few of these sound familiar, that tight cuticle layer is likely the reason. It's not that your hair is high-maintenance or that you're doing something wrong. It's that low porosity hair simply needs a different approach than what most generic hair advice assumes.
Why this actually matters
Most hair advice is written for an "average" hair type that doesn't really exist. When you don't know your porosity, you end up guessing; trying products and methods that work great for someone else's hair and wondering why your results don't match.
Once you know you're working with low porosity hair, the guessing stops. You start understanding why your hair behaves the way it does, and what it actually needs instead of what it's "supposed" to need according to a label.
Where to go from here
Understanding the term is step one. The next step is figuring out what your specific hair needs based on that, and that's where most people get stuck.
That's exactly why I built the Wash Day Decision Tree™. It walks you through what your hair is actually asking for, step by step, instead of leaving you to guess. Pair it with the Guide to Oils to understand which products and ingredients make sense for low porosity hair specifically.
Healthy hair starts with understanding, not guessing.
