As a guy with naturally wirey dry hair, but with a preference for long hair, frizz has been the bane of my life. Now in my 30s, I've had jaw length or longer hair on 3 separate occasions. My hair is neither straight nor curly, just wavy and frizzy. I've tried pretty much everything to tame my hair. Frizz-ease, GHD straighteners, Swiss Formula Emergency Hair Repair, etc. They've all worked to a degree, but when confronted with water in any form (whether it be general humidity, rain or my own perspiration on a hot day), the frizz returns. Similarly any gels, mousses or sprays that I've tried also get ruined by moisture or if their "lock" is broken and anything moves my hair from its styled position.
Every time, after spending fortunes on alternatives, I end up coming back to Black & White. It doesn't "hold" like a gel. It can make your hair look greasy. But in my experience, it totally eradicates the frizz. In all conditions. And that in itself is a wonder for people with hair like mine. It won't, in itself, straighten curls or lock in a style, but it converts my would-be Krusty the Clown hair into a vaguely under control surfy look which still moves about and can be restyled at will. If you have "problem" hair and haven't tried it, you definitely should.