Footloose and Frizz-Free

I've got pin-straight hair--that means it should be frizz-free, right? Guess again. In hot, humid weather--like the kind we've been having here in NYC lately--my hair turns into a tangled, frizzy mess. Adding a bit of hair spray (I like Frederick Fekkai's) after I blow dry my locks helps a bit. One of my colleagues swears by Japanese hair straightening, a.k.a. thermal conditioning (yes, even for already straight hair--particularly if you like that super-flat look that's in style right now). But another friend with hair similar to mine recommended that I try a far less expensive solution: Citre Shine's Shine Miracle Anti-Frizz Serum; I'm going to give it a go later this week. At less than $8, it's worth a shot!