Try Aveda's Light Elements Smoothing Fluid! It works great! It's a small bottle, and sort of pricey, but it lasts a long time. I have very frizzy hair if I don't flat iron, and it used to get frizzy or fuzzy in humid weather, but not any more. You just use a couple of "pumps" on each section before you iron it, and it stays smooth. I also have dry hair and scalp, so I can't shampoo every day, and my hair stayed great for 3 days at a time at Disney without having to redo it!