My hair is normally considered straight by anyone who sees me. In humid conditions, it gets really frizzy, which I only noticed when I was in Japan. Even though I have straight hair, I sometimes blow dry with a round brush to make it sleek. The other day, I used a competing brand of anti-frizz shampoo that sleeked out my hair without any need for blow drying. Every hair was in place. Yesterday, I used Mystic, which made my hair frizzier than I've ever seen in my 40 years of living in the desert. As a shampoo, it works, but not for frizz.