Silk is the fine thread with which a silkworm spins its cocoon. ... The thread which is produced by the spinning glands of the silkworm is the finest and strongest natural fiber in the world. Silk is a protein fiber, meaning that is chemically quite similar to human skin. Because of this, silk is an ideal "second skin".
Silk Pillowcase Benefits for Skin. Additionally, your complexion can benefit from a silk pillowcase, especially ifyour skin is on the sensitive side. ... Just like it helps your hair stay hydrated, silk won't draw the moisture out of your skin.