Hair shafts grow from hair follicles situated in the dermis and hypodermis. Every hair consists of a root, the part that lies under the skin, and a shaft, the part that extends from the follicle above the skin. Hair grows on every part of the skin except the palms of the hands and soles of the feet. Hair varies in length, thickness, and color on different parts of the body and on different people. In some parts of the body, as in the skin of the eyelids, the hairs are so short that they do not to project beyond their follicles and on the face are fine, light sensory hairs called vibrissae. In other parts of the body, as on the scalp, the hair is much longer and thicker.