The only way you would get dead straight hair is to get it from donors with dead straight hair.

From what I have heard, most of the hair that is used started out with some degree of curl and is chemically and/or heat straightened, the first time you get it wet you will see that it isn't TRULY straight. I have some extension hair I bought to ventilate with, and my stylist showed me how that works. Even though the hair looked straight as an arrow in the package it really isn't.

Maybe BA or Debbie can confirm this.....