Why your curls need moisture

Think of a strand of hair.  Most people picture a cylinder shape.  Unless we're talking about stick straight hair, the strand isn't going to be so round.   The curlier your hair is, the more flat and ribbon like the hair actually is.  Which is one of the main reasons curly hair tends to be so dry.  There just isn't as much structure for moisture and oils to live in.  If you have curly or even wavy hair, you should probably be using shampoo and conditioners that are labeled Hydrating or Moisturizing to keep your hair less frizzy.