As the largest organ in your body, your skin acts as a barrier between the outside world and your physical self. (infraredsauna.com)
Not only does it help to maintain their bodies environment by helping to prevent the loss of moisture, it also serves as a barrier against parasites, the elements, and infections. (puppywire.com)
It also keeps the house cool in summer by acting as a barrier between the hot weather outside and the cool interior. (psmag.com)