This fitted sheet is made of oyster white 100% 22 momme mulberry silk. Silk is a fabric that helps us to protect our skin while sleeping, keeping it soft and hydrated. These are some benefits of sleeping on a fabric such as silk: • Silk is a soft fiber that is smooth on your skin, helping to prevent wrinkles and marks. • It is breathable and hypoallergenic, helps keep skin moisturized and helps the products that you put on your skin before going to bed work overnight.