most people that relax their hair are only interested in wearing their hair straight (not their natural curls). that's what i did for 16 years, although the no-lye relaxers still didn't take all of the texture out of my hair. what i had was basically a texturizer, which is semi-relaxing the curl so it's not as tight. this enables you to wear a curly style, but also when you straighten your hair it tends to hold better (in my experience anyway) because of the chemical alteration to your hair strands.
hope that helps
i stick with the description "OS thready thick"
my curly fro now is at collarbone when straightened.... basically the length i had when i started transitioning! hooray for growth!!! =)