Hair poof.....help!?

i have really thin hair and i straighten it but i want the top to look more poofy rather tan flat and draggen down. i also dont want to put too much product up at the top because my hair tends to get dirty quick ....any advice besides teasing?

don't tease..just take a section twist push pin..thats your poof without any teasing...if your hair is long enough you don't need hairspray or any product in your hair