I'm a kerastase masquintense user (for about the last ten years) and although it does work to make my thick frizzy hair softer and more manageable, I still found I had to follow it with kerastase serum and a careful blowdry/straighten to make my hair actually look nice (I have bad frizziness around my temples in particular which is a nightmare to manage). Have tried a whole load of other things including argan oil (= greasy mess or no impact depending on how much/little I used) but this was probably the best solution until I stumbled upon these two on sale about a month or two ago:
this first (I dont buy it from here tho!)
then this
Just thought I'd share as my hair is in the best condition it's been in for a long time. I'd like to try more of the sulphate free treatment masks now too.