Skin - from the bottom up
Looking at the diagram opposite, we can see the different layers of the skin that work on temperature and protection.
The subcutaneous layer is the inner-most, fatty layer, found at the bottom of the skins structure. This helps to insulate the body and also works to provide protective cushioning for our muscles and bones.
On top of this layer of fat is the dermis, which is a thick layer of fibrous, elastic tissue that gives our skin flexibility and strength. Within this are our nerve endings, sweat and sebaceous glands, hair follicles and blood vessels, all of which work to regulate our body.
On top of the dermis is the epidermis which is a relatively thin but tough layer. This is made up of cells called keratinocytes, which are gradually shed from the skin surface.
The final, outer layer of our skin is called the Stratum corneum and is often referred to as the 'skin barrier'. This is made up of skin cells that which we often call 'the bricks' and lipids which we call the mortar. So if you imagine that your skin is like a brick wall, you are looking to have all the layers - bricks - of your skin fully aligned, with lots of lipid - mortar - keeping the gaps filled between the bricks filled.