Protect Hair When Flat Ironing

The thing I like most about GHD flat irons is how my hair looks naturally pin straight when I use mine.  I am not sure about the technology GHD uses but it is worth every penny.  I have never experienced such consistent and natural results with any other flat iron.  I try not to use it everyday because I do not want to risk heat damage and I make sure that every time I do use it I protect my hair with a thermal spray.  My sister fried her hair growing up, flat ironing everyday.  Sure, she used a cheap iron but still, I am not taking any chances.  I want my hair to stay healthy and sleek looking for as long as possible!