Frizz is not your hair misbehaving. It is a moisture exchange happening between your hair and the air around it, and once you understand the mechanism the solution stops being a matter of fighting it.
What frizz actually is
Each strand is wrapped in overlapping cuticle scales. When they lie flat, hair is smooth and shiny. When they lift, three things happen: the surface scatters light instead of reflecting it, strands catch on each other instead of sliding, and moisture moves freely in and out of the fibre.
Dry hair in humid air pulls moisture from the atmosphere. The fibre swells unevenly, the cuticle lifts further, and the strand bends and separates from its neighbours. That is frizz.
Which gives you the counter-intuitive rule: frizz is usually a sign your hair is thirsty, not that it has too much moisture. Hair that is properly hydrated has less reason to grab water from the air.
Porosity, briefly
Porosity describes how readily your cuticle lets moisture through.
High porosity hair — often colour-treated, bleached, heat-damaged or naturally coarse — has a lifted, gappy cuticle. It absorbs water fast, loses it fast, and frizzes readily. It needs moisture and it needs that moisture sealed in.
Low porosity hair has a tightly packed cuticle that resists water going in. Products sit on top. It frizzes less but goes limp and coated easily, and does better with lightweight products and a little warmth to help absorption.
Most frizz complaints come from the first group.
The two-step fix
Add moisture, then seal it. That order, always.
- Start with damp — not soaking — hair, ideally with a leave-in conditioner already in it.
- Warm two or three drops of oil between your palms until they are barely shiny.
- Smooth over the surface and through the ends, following the direction the cuticle lies — downward, never up.
- Leave it alone while it dries.
Oil applied to dry, already-frizzy hair coats the surface and adds shine, but it does nothing about the underlying dryness. It is a patch, not a fix.
What creates frizz while you're not looking
- Towel-rubbing. The single biggest offender. Squeeze with a microfibre towel or a cotton t-shirt instead.
- Brushing dry hair — particularly curly or wavy hair, where it separates the clumps that hold the shape.
- Hot water. It lifts the cuticle. A cooler final rinse helps it lie flat.
- Touching it while it dries. Every touch disturbs the cuticle as it sets.
- Cotton pillowcases. Eight hours of friction, every night.
What doesn't work
More product. The instinct when frizz appears mid-afternoon is to add oil, which usually produces greasy frizz rather than smooth hair. If your hair frizzes reliably by the afternoon, the intervention belongs in the morning — more moisture at the damp stage — not at three o'clock.
Also worth abandoning: the idea that frizz can be eliminated. In genuinely humid weather, textured and porous hair will move. The goal is smooth, defined, healthy-looking hair — not a helmet.
For sealing, look for something light enough not to weigh hair down. Our Smoothing Leave-In Serum Spray and conditioning masks are built around this two-step approach — moisture first, seal second.