I'm not sure about this statement but maybe 4c hair is hair that isn't moisturized enough and doesn't have a holding product in it.

When my mom first saw my hair she said I had 'Z' hair. It was that bad. I didn't know what to do and I was getting tired of doing my hair. I slept with deep conditioner (cholesterol) and washed it out in the morning. I raked gel through my wet hair with my fingers and BAM! I have the tiniest coils i've ever seen. They're defined now but when I wash my hair, I will have 'z' hair again lol.
Attached Images
4a/b Hair!
BC'd - October 2010 with about 2 inches of growth

Eco Styler, Suave Naturals, Shea Butter, Aloe Vera, Olive Oil, Cholesterol, Glycerin & Honey