Standardized Result Piezo Technology . Hair can be found all over human body, except for the palms of hands and at the soles of feet. The diameter of a human hair does not have a standard value since different people have different hair structures. Your genetic makeup can cause the width of your hair to differ from that of other people.
Hair color is also a big factor.
Black hair is thicker than is red hair. The weather can also affect the diameter of a hair strand. As the weather gets warmer, the diameter of body hair increases. Age is another factor. Babies and young children have finer hair than adults.