What can I use to make my hair have more volume?

My have very fine, thin, limp and very straight hair. The best thing I've used so far to give my hair volume is one of those volumizers that you put on the end of your hairdryer and it doesn't even work all that well. I want something that REALLY works!

ANY suggestions that you have would be greatly appreciated! Thank you for your time!!!

Please can anyone help me with this problem?

Hey GoodGirl!
I have hair just like yours.Here's what works for me.Shampoo your hair,then use Infusium leave in conditioner.Just spray it on,don't overdo.Then I use a root lifter(gel)only on the roots.Then hold your head upside down and blow dry.This makes my hair do great!If you ever want to curl the ends,use a round brush and a hot/cold dryer.Hope this helps!
Brandi

Thank you sooo much for your response!!! I'm going to get the root lifter tomorrow! I've got the rest! Thanks a lot!!!! Have a great day!