Bumble and Bumble Defrizz 4.2 oz
Does exactly that (and more).
What: Protects against frizz, acts as a barrier to humidity and leaves hair soft, silky and flyaway-free.
Who: Anyone; good for curls and frizz-prone types.
When: Anytime; after Prep or Tonic Lotion, before, during and after styling.
How: Squeeze a few drops onto palm, work through hair with fingers; use on damp hair to define curl and control frizz (blow dry or let dry); on dry hair to add sheen, control flyaways and add movement.