Silk pillowcases have several benefits for hair and skin. They are hypoallergenic, which means they are less likely to cause skin irritation or allergic reactions. Silk is also smooth and soft, reducing friction on hair which can help prevent split ends and reduce hair breakage. Additionally, silk pillowcases do not absorb moisture from the skin and hair, helping to keep them hydrated. This can result in smoother hair and less skin creases when you wake up in the morning.