Our skin is waterproof thanks to a combination of factors:
- Keratin: The outer layer of our skin, called the epidermis, is rich in a protein called keratin. Keratin is insoluble in water, forming a tough barrier that prevents water from penetrating our bodies.
- Sebum: Our skin also produces sebum, an oily substance secreted by glands in the skin. Sebum acts as a natural moisturizer, creating a waterproof layer on the surface of the skin.
- Tightly packed cells: The epidermis is made up of many layers of epithelial cells, tightly packed together. This structure helps create a barrier that prevents water from passing through.
- The skin's natural oils: Our skin naturally produces oils that help to create a waterproof layer. These oils are essential for maintaining the skin's barrier function and preventing dehydration.
While our skin is waterproof, it's important to note that it's not completely impervious to all substances. Certain chemicals, such as those found in some cosmetics and cleaning products, can penetrate the skin. Additionally, our skin is designed to allow water to pass through in the form of sweat, which helps regulate body temperature.
