About this itemSilk pillowcase & Cotton pillowcase – The two sides of the pillowcase are made of different materials. One side is made of 100% cotton. One side is made of 100% mulberry silk. One pillowcase is equivalent to having TWO different pillowcases. You can easily adjust the material of pillowcase at any time according to the different needs of different timeSilk Pillowcase for Hair and Skin – Silk nourish the skin, Especially for sensitive skin and delicate skin. Silk pillowcases not only beauty wrinkle-free, but also keep the hair supple and smooth, prevent hair from becoming knotted and matted.Cotton Pillowcase – The fabric is sanforized (pre-shrunk), mercerized, and bio-polished. extremely durable and super soft.Natural and environmentally friendly.Zippered Pillowcase – Hidden zipper keeps your pillow safe and secure inside the case all throughout the night. Pillowcases are available in Standard Queen & King sizes.100% Guarantee: Please feel free to contact us to get a FREE Replacement if there is any problem on our products. Welcome every customer contact us to give us some advice and suggestions, we will try our best to improve it .