Hair texture is the measure of the circumference of the hair strand
itself. Professionals classify the texture of hair as being "coarse", "fine", or "medium".
Coarse hair has the largest circumference, and fine hair has
the smallest. Medium texture indicates a middle-range of the size of the
hair shaft, it's considered normal and poses no special considerations
regarding processing and chemical services.
Coarse hair is stronger, for obvious reasons - it has more substance. However, coarse hair can also
be harder to process, and can be resistant to haircoloring services,
perming, and straightening. Fine hair, conversely, is often very easy to
process, and can be over-processed easily and is susceptible to damage from chemical services.
Hair texture varies from individual to individual, and can be different
in separate areas of the same head. You may have coarse hair on the
top of the head and fine hair at the nape of the neck. Race and ethnicity
are irrelevant in determining hair texture, as coarse, medium and fine hair
can be found among all racial and ethnic groups.