Products that de-frizz

Hiya!

     I know school jsut got out, but i'm already freaking out about school pictures in August..I absolutely hate it! When the weather is nice and it isn't muggy out, my hair is good. But in the summer months if i straighten it, or say it just rained out, holy crap does my hair suck... it just poofs...

     If i let ir dry naturally, its kinda frizzy and a little wavy, it is hidious. If i just blow dry it, it's still frizzy, but straighter. If i blow dry and flat iron it, It's straight, silky, and smooth. I like the last style the best(duh) so i usually straighten it every day.

      Anyway, back to my problem. Last year i was getting ready in the bathroom at home, and my hair was perfect... and then i get to school and it's really frizzy, dull, and limp. It really pissed me off.. i've seen a lot of commercials for hair products that help your hair stay smooth and silky, but i don't want to go buying random things, can anyone suggest what works best? My hair is at the middle of my back, and it's really fine. Can someone please help me?

Garnier Fructis anti-frizz serum is pretty good also.