Hair porosity quiz

Hair Porosity Quiz: How to Test Your Hair Porosity at Home

If your hair seems to either soak up everything and stay dry, or repel water and take forever to dry, porosity is probably the missing piece. Porosity is one of those words that sounds technical, but the idea is simple. Here's the easy way to think about it: porosity is just how well your hair takes in moisture and how well it holds onto it. Once you know yours, a lot of "why won't my products work?" frustration finally makes sense.

What Hair Porosity Actually Means

Every strand has an outer layer called the cuticle, made of tiny overlapping scales kind of like shingles on a roof. How tightly or loosely those scales sit is what determines your porosity. When the cuticle lies flat and tight, water has a hard time getting in or out. When it's lifted or has gaps, moisture rushes in and escapes just as fast. There are three general categories:

• Low porosity: The cuticle is tightly sealed. Water beads up and rolls off, products tend to sit on top, and hair takes a long time to fully wet and to dry.
• Medium (normal) porosity: The cuticle is slightly looser. Moisture goes in and stays a reasonable amount of time. This type is usually the easiest to manage.
• High porosity: The cuticle is raised or damaged. Water absorbs almost instantly but leaves quickly too, so hair can feel dry, frizzy, or thirsty soon after styling.

High porosity can be something you're born with, but it's often the result of heat, color, or chemical processing lifting and roughing up the cuticle over time.

How to Test Your Hair Porosity

You don't need anything fancy. The classic check is the float test, plus a couple of everyday signs that often tell you more than the test itself.

• The float test: Take a clean strand (no product, freshly washed) and drop it into a glass of room-temperature water. If it floats for a while, you likely lean low porosity. If it sinks slowly and hovers in the middle, that's medium. If it sinks quickly, that points to high porosity. Treat this as a rough hint, not a verdict, because stray product can throw it off.
• The spray test: Mist a section of clean, dry hair with water and watch. Beading on top means low porosity; quick soaking-in means high.
• The everyday signs: Notice your dry time and how products behave. Slow to wet, slow to dry, and products that sit on top point low. Fast to wet, fast to dry, and a constant thirst for moisture point high.

Looking at the pattern across all three is far more reliable than any single test.

How Porosity Changes What Works for You

This is where it pays off, because porosity often matters more than hair type for choosing products and techniques.

• Low porosity: Reach for lightweight, water-based products and use gentle warmth (a warm towel, or applying products on damp hair in a warm shower) to coax the cuticle open. Avoid piling on heavy butters that just sit there.
• Medium porosity: You have the most flexibility. A balanced routine usually keeps things happy, with occasional deep conditioning.
• High porosity: Lean into richer creams and sealing steps (like an oil or butter over a leave-in) to lock moisture in. Cooler rinses and anti-frizz layering help close that lifted cuticle.

What is the difference between low porosity and high porosity hair?

The short version: low porosity hair resists moisture going in, while high porosity hair lets moisture in easily but can't hold it. Low porosity often looks healthy and shiny but feels like products just won't absorb, and it takes ages to dry. High porosity drinks up water instantly yet feels dry and frizzy again soon after, and it usually dries quickly. The strategy flips accordingly: low porosity needs help opening up and avoiding buildup, while high porosity needs help sealing moisture in. This is general guidance, not medical advice, so see a professional if you're concerned about damage.

Pulling It Together

Test your porosity, then match your products to whether your cuticle needs help opening up or sealing shut. Pair that knowledge with your curl pattern and you've got a real routine instead of trial and error. When you want to keep refining, take a look at my other free tools to round out the picture.