Filed under
Beauty / Hair / Best Of
Tested over
4 months in Bangkok
Published
September 22, 2026
Best by Lauren may earn a commission when you shop through certain links. Every product here was bought with my own money or tested for at least six weeks. No brand has paid to be included, and nothing is ranked higher because it pays more.
I spent four months somewhere genuinely humid and tested every anti-frizz claim I could buy. Here is the finding nobody selling hair products will tell you: nothing beats real humidity.
What good products do is buy you time — an extra three hours, an extra day between washes — and that turns out to be worth quite a lot.
What actually works
A leave-in with a silicone or oil seal, applied to damp hair before anything else. The physics is simple: frizz is hair absorbing moisture from the air, and a seal slows that down.
Air-drying rather than blow-drying, in humid places. A blowout in Bangkok lasts about four hours; air-dried hair with product in it lasts two days. I resisted this conclusion for a month.
Dry shampoo as a texture product, not a cleaning one. It absorbs the moisture that makes hair go flat and greasy by mid-afternoon.
What does not
Anything marketed as "humidity-proof" with a light, water-based texture. If it feels like nothing, it is doing nothing — the products that work all have some weight.
Heat protectant as a frizz solution. It protects from heat, which is a different problem.
The blowout question
Getting a blowout in a humid city is a four-hour purchase. Worth it before an event, never worth it for a day out.
If you do get one, sleep in silk and do not wash it. You can usually get a usable second day out of it with dry shampoo, and almost never a third.
