This sheet by KingKat is made from 100% Mulberry Silk: 19 Momme, Grade 6A, 100% pure long-strand silk, OEKO-TEX STANDARD and certified to be safe from harmful chemicals. It is the perfect addition to your little one's nursery. KingKat 100% Pure Mulberry Silk Sheets are the perfect choice for your baby's sensitive skin, as they are hypoallergenic. All KingKat sheets are made from Momme 19, 6A, 100% pure long-strand silk Mulberry silk, which helps to prevent irritations. It is also temperature regulating, keeping your baby cool in the summer and warm in the winter. 100% Mulberry silk is the highest quality silk you can get. Mulberry silk is made from silkworm cocoons. Momme is a unit of measurement that is used to describe the weight of silk. The higher the momme weight, the higher the quality of the silk.