The average thickness of human skin is about 2 millimeters (mm). Skin is made of three main layers: the outer epidermis, the middle dermis, and the inner hypodermis or subcutaneous layer. The thickness of the skin can vary depending on the part of the body. For example, the skin on the soles of the feet and palms of the hands is thicker to protect these areas from friction and pressure, while the skin on the eyelids is very thin. The skin acts as a protective barrier against germs, chemicals, and injury. It also helps control body temperature and allows us to feel touch, pain, heat, and cold. The thickness of skin helps it perform all these important jobs effectively.