The Short Answer: The Float Test Takes Two Minutes and Tells You More Than Any Curl Chart

Most natural hair advice starts with curl pattern — 3B, 4A, wash-and-go versus twist-out. But two people with the exact same curl pattern can need completely different routines, because curl type and porosity aren't the same thing. Porosity is about how easily your hair's outer cuticle layer lets moisture in and out, and it's the single biggest reason a product that's a holy grail for one curly-haired friend can leave your strands greasy, or another leave them bone dry.

The good news: you don't need a lab or a stylist to find out. A few simple at-home checks, done together, give you a reliable enough picture to actually change how you shop and how you build a wash day.

Why Porosity Matters More Than Curl Pattern

Hair is made of overlapping cuticle scales, a little like shingles on a roof. When those scales lie flat and tight, water and product have a harder time getting in — and once moisture is in, it has a harder time getting back out. When the scales are lifted or gapped, the opposite happens: water rushes in fast, and it rushes back out just as fast.

That single difference explains a lot of "my hair does the opposite of what everyone says" frustration:

• Products that sit on top of the hair instead of absorbing
• Hair that dries unusually fast — or takes forever to dry
• Conditioner that seems to do nothing, no matter how much you use
• Hair that frizzes the moment humidity rises

Curl pattern describes the shape of the strand. Porosity describes how the strand behaves with water and product. You need both pieces of information, but porosity is the one most routines skip entirely.

The Float Test: The Most Common At-Home Check

The float test is the one most people have heard of, and it's a reasonable starting point as long as you follow it carefully.

• Start with a clean strand. Pull a single strand that has naturally shed — don't pluck one from your scalp — and make sure it's completely free of product residue. A strand from unwashed, product-heavy hair will give you a false reading almost every time.
• Drop it into a glass of room-temperature water. Let it sit undisturbed for two to four minutes.
• Watch where it settles. A strand that floats near the surface the whole time suggests low porosity — the tightly closed cuticle is resisting water absorption. A strand that sinks slowly and hovers in the middle suggests medium porosity. A strand that sinks quickly to the bottom suggests high porosity, where the cuticle is letting water in fast.

The float test isn't perfect on its own — oil left on the strand can make even high porosity hair float, and static or airflow in the room can nudge a strand around. That's why it works best as one data point, not the whole verdict.

The Strand Test: A Faster Backup Check

The strand (or texture) test doesn't require any water at all, which makes it a useful second opinion.

Take a clean, dry strand and gently slide two fingers down its length, from tip toward root. Pay attention to what you feel:

• Smooth the whole way down — the cuticle is lying flat, which points toward low porosity.
• Slightly textured or a little rough in spots — points toward medium porosity.
• Rough, bumpy, or catches on your fingers — points toward high porosity, where raised or gapped cuticle scales create friction you can actually feel.

Check a few strands from different parts of your head, since porosity isn't always uniform — ends that have seen more heat, sun, or styling often read higher porosity than newer growth close to the root.

The Spray Test: A Third Data Point

If the float and strand tests disagree, the spray test can settle it. Mist clean, dry hair lightly with water and watch the first few seconds. Water that beads up before slowly absorbing points toward low porosity; water that soaks in almost instantly points toward high porosity. Where two out of three tests agree is a far more reliable read than any single test alone.

What Your Result Actually Means for Your Routine

Low porosity hair resists moisture getting in, so the goal is helping product absorb rather than sit on top of the strand. That usually means applying product to damp, not dripping, hair, favoring lighter humectant-rich formulas over heavy butters, and using gentle warmth (like a warm towel wrap) to help the cuticle open enough for product to actually get in.

High porosity hair takes moisture in fast but loses it just as fast, so the goal shifts to sealing. That usually means layering a moisturizer with an emollient that helps seal the cuticle, and being more consistent about moisture replenishment between wash days since it doesn't hold onto hydration as long.

Medium porosity hair generally has the easiest time with a broad range of products and needs the least adjustment — the cuticle is close enough to balanced that most formulas work as intended.

Common Mistakes That Skew Your Results

• Testing a strand with leftover product on it. Silicones, oils, and heavier styling products coat the cuticle and will make almost any hair float or bead water, regardless of actual porosity.
• Testing only one strand. Heat damage, color processing, and sun exposure can raise porosity unevenly, so one strand from your ends won't necessarily represent your roots.
• Relying on a single test. Each method has its own blind spots. Two tests agreeing is a far better signal than one test alone.
• Assuming porosity never changes. Heat styling, coloring, and even sun exposure can shift porosity over time, so it's worth rechecking every few months, especially after a color service or a heat-heavy season.

Building a Routine Once You Know Your Porosity

Whatever your result, the formula you use matters as much as how you apply it. Roots & Locks Moisturizing Revival Shampoo uses coco betaine and coco taurate as its primary cleansers — gentler than harsh sulfates — along with aloe leaf juice extract and coconut milk, so hair feels clean without the over-stripping that leaves any porosity type worse off. Coconut milk in particular is a lighter addition that won't weigh down lower porosity strands.

The Roots & Locks Moisturizing Revival Conditioner pairs organic shea nut butter with guar hydroxypropyltrimonium chloride, a plant-derived conditioning agent recognized for the smooth, slippery feel it leaves behind — useful for higher porosity strands that need help sealing after they've absorbed moisture. For lower porosity hair, applying this conditioner to damp (not soaking) hair and focusing it mid-shaft to ends, rather than piling it on at the root, tends to work with the cuticle instead of just sitting on top of it.

The Bottom Line

Porosity testing isn't about getting a perfect scientific label — it's about understanding why your hair reacts to products the way it does, so you stop fighting your routine and start working with it. Run the float test, the strand test, and the spray test together, look for where they agree, and use that as your starting point rather than a rigid rule.

Once you know what you're working with, the Roots & Locks Moisturizing Revival Shampoo and Roots & Locks Moisturizing Revival Conditioner give you a botanical base to build on, or explore the full natural hair care collection to round out a routine suited to your porosity.