Straight Sexy Hair, Smooth And Seal Anti frizz spray. You don't have to have straight hair for this! Its a really good anti-frizz spray, its almost like a mist and it does not leave your hair hard. It adds a ton of shine and very lightweight.
I also like Redken 23, it has max. hold. 24 hour humidity control and helps with those fly-aways.
Both of these products are available in a travel size in case you want to try them before you commit.