Mulberry silk pillowcases are composed of protein fibers, and have excellent bio-compatibility with the human, very smooth surface, the friction coefficient of stimulus to the human body is the lowest in all kinds of fiber. BENEFITS OF SILK PILLOWCASE SKIN CARE It's long been a secret of the beauty industry that silk pillowcases can make an amazing difference to the appearance of your skin. Wrinkles appear smoother and there are no creases or marks from the pillowcase. HAIR CARE Wake up in the morning with hair that's smooth as silk. The natural proteins present in silk together with its amazing smoothness mean that your hair doesn't get matted or dried out when your head rests on silk overnight. That's why top models always insist on silk pillowcases. LONGER-LASTING HAIRSTYLE Mulberry silk pillowcases are gentle, extremely soft and smooth. They can help keep blow dries/hairstyle for a long time, while cotton may snarl hairs and even twist them at the root. KNOW MORE ABOUT SILK MULBERRY SILK Mulberry silk is the highest quality silk available for purchase. It is a kind of natural fiber that is much smoother, lighter and stronger than any other fibers in the world. MOMME WEIGHT Momme (mm) is the unit of weight traditionally used to measure the density of silk. It is similar to the use of thread count for cotton fabric. Usually, higher momme weight indicates more durable weave and luxurious fabric. 16 - 25mm is suitable for pillowcases.