About this item 100% 19mm mulberry silk, the most comfortable silk pillowcase available.Dermatologist recommended for silk’s natural hydrating properties, silk does not absorb face creams like cotton can. Silk pillowcase help make the hair more smooth, avoid morning bed head. Best choice for those who have long or curly hair.Hidden zipper design, comfort and better fit, help prevent the pillow from slipping out.Hypoallergenic, soft, strong, silky, smooth and breathable natural fiber, luxurious silk on both sides.Standard Size is 20??*26?? ??51cm*66cm). A combination of 2 pieces is more cost-effective and affordable.