What am I supposed to use before i curl my hair with a straightener? Hair protect thingy?

i heard im supposed to use some stuff to put in my hair that will stop it form getting damaged or burned? What exaclty is that i need called? and could i get it at a Walgreens?What am I supposed to use before i curl my hair with a straightener? Hair protect thingy?
Heat Protection Spray. I use Toni%26amp;Guy. Chi makes a good serum to put in your hair.


Fructis makes a serum too that works. You could get this at Walgreens.