[ Real Silk] - Both sides of silk pillow case and silk sleep mask are made of organic silk. It's a soft, breathable, hypoallergenic and organic fiber. [Anti Aging & Anti Sleep Crease]- Silk pillowcase, the natural anti-aging product, soft and breathable, prevent irritation to your delicate skin. It could reduce stretching and tugging on hair & delicate skin, prevent hair from tangling & split ends, keep your skin's moisture and reduce wrinkles. [ & Long-Lasting]- Using the real silk fabric with exquisite workmanship, Twin Hem Stitching, 600 Thread Count, Hidden Zipper design, which makes the silk pillowcases more steady and firm. Superior plain color - non dyes, not easy to fade after washing.