Royal Silk products primarily feature high-quality silk fibers, specifically 100 percent mulberry silk, which is one of the finest and most luxurious types of silk available. Mulberry silk is renowned for its softness, durability, and rich luster, making it an excellent choice for a variety of silk goods. The fiber content of their products is designed to ensure a comfortable and elegant experience for users. Different styles and products may also incorporate a blend of silk with other materials to provide specific features, such as added stretch or durability. For more detailed information about the fiber composition of specific items, it is advisable to check the product descriptions on the current web page. This will provide a comprehensive understanding of the materials used in Royal Silk's offerings.