Kerastraight-Straight Maintain Shampoo

I never tried sulphate-free shampoos prior to this so I don't know if they're suitable for my thick, coarse and slightly frizzy hair. I had Brazilian Keratin treatment last year and was...

BEST SHAMPOO I'VE EVER TRIED!!!! It's very expensive,but well worth it. It's marketed to maintain those Brazilian Keratin treatments, which I don't get, but it works equally awesome without it....