Asymmetrical follicles yield hair that curls, symmetrical follicles yield straight hair. The longer curly hair grows, the more complex its structure can be, says a study reported in a journal of ...

or coily (very curly, coiled strands). The shape of hair follicles determines how curly or straight hair is. Round hair follicles produce straight hair, while oval and curve-shaped hair follicles ...

No matter what type of curls you have, the curl pattern is determined by how the hair follicle ... shape, so styling products with a firm hold is critical. You can also use gels made for curly ...