The integument describes the outer covering of the body, which provides protection and acts as the first line of defense against the environment and germs. The integumentary system includes your skin, hair, nails, and oil and sweat glands. Your skin, hair and nails are largely protective, while sweat glands help control your body temperature and assist with waste excretion. Oil glands help keep your skin moist. Additionally, nerve receptors in your skin provide information about touch, heat, cold and pain.