Frizzy hair happens when the outer layer of your hair shaft, called the cuticle, lifts up instead of lying flat. Once that happens, moisture escapes unevenly and humidity from the air sneaks in, causing each strand to swell and separate from the ones around it. That swelling and separating is what you're seeing, and fighting, every time you call your hair frizzy.
The good news: frizz isn't random. It's caused by a handful of specific, fixable things, and once you know what they are, you can actually do something about them instead of just reaching for whatever serum is on sale.
What Causes Frizzy Hair
Frizz is rarely one single thing. It's usually a mix of the causes below, so it helps to know which ones apply to you.
Humidity and Weather
Humid air is the most common frizz trigger, and there's a reason for it: your hair is trying to reach the same moisture level as the air around it. If your cuticle is already a little rough, it absorbs that extra moisture unevenly and swells more than smooth, healthy hair does. That's why the same humid day gives one person soft waves and another person a full halo of frizz.
Hair Damage and Porosity
High porosity hair, meaning hair with a cuticle that's been roughed up by color, heat, or chemical treatments, tends to frizz more because the cuticle doesn't lie flat to begin with. If you're not sure where your hair falls, our Hair Porosity Test article walks through a 60-second way to check.
Harsh Products and Buildup
Stripping shampoos and alcohol-heavy products can leave your cuticle rough and dehydrated, which invites more frizz, not less. Heavy, silicone-based conditioners cause a different problem: they coat the hair instead of absorbing into it, and that buildup can make frizz worse over time. Read Is It OK to Use Synthetic Conditioners for more on why formula matters as much as how often you condition.
Heat Styling and Hot Water
Blow dryers, flat irons, and curling wands all apply direct heat that strips natural oils and roughs up the cuticle when you're not using any protection. Hot showers do something similar over time. Lukewarm water is kinder to your cuticle, even if a hot shower feels better on a cold morning.
Overwashing and Rough Towel-Drying
Washing too often strips the natural oils that keep your cuticle smooth, and rubbing wet hair with a regular towel adds friction that roughs it up further. Both add up to more frizz, no matter how good your shampoo is.
How to Actually Stop Frizzy Hair
You don't need a ten-step routine to calm frizz. You need the right few steps, done consistently.
- Wash less often. A couple of times a week is plenty for most hair types
- Rinse with lukewarm water instead of hot
- Dry gently. Squeeze out water with a microfiber towel or an old t-shirt instead of rubbing with a regular one
- Apply a leave-in conditioner while hair is still damp to seal in moisture and protect against heat before you style
If you're working with curls or waves, How to Maintain Better Curl Definition has more on building out this routine.
Best Products for Frizzy Hair
The right leave-in conditioner does double duty: it seals in moisture and gives you a layer of protection before heat gets involved.
For everyday frizz control and curl definition, The Mighty Curl Leave-In Conditioner in Papaya + Coconut is an all-in-one leave-in cream that helps de-frizz and smooth split ends, and promotes stronger and smoother-looking hair. It's clean, formulated without SLS/SLES, parabens, phthalates, silicones or synthetic dyes, and gentle on color-treated hair.
If you heat style regularly, reach for The Multi-Miracle Leave-In Conditioner + Heat Protectant in Coconut + Agave. It helps detangle and tame frizz while delivering lightweight silky hydration, and helps provide protection against heat damage from your blow dryer or hot tools.
Need help working a leave-in into your routine? How to Use Leave-In Conditioner covers exactly that. Or browse the full hair care collection to find your match.
Shop our hair care collection to build your frizz-fighting routine.
