Curly hair tends to do so down the entire length of the hair shaft. Strand thickness can range from fine to coarse but is most often fine. The greatest challenges for curly hair types are frizz, lack of curl definition, shrinkage and dryness, to a lesser extent.
This hair type has the tightest curls ranging from fine to coarse with s-shaped and z-shaped curls with everything in between! It is the most fragile of the types. If curl definition is a challenge for curly hair types it's almost an impossibility for kinky-curly hair. Additionally, shrinkage and dryness are two issues to constantly fight against.