OEKOTEX certified materials. Front side is 22 momme 100% 6Aclass mulberry silk. Back side is 100% lyocell with 600 thread count, featuring an envelope design on the back to secure the pillow. Multiple sizes and colors. Available in a range of sizes and colors to fit most pillows. quality, durable solid colors. The stitching is neat and the workmanship is exquisite, and the fabric remains reliable after washing. Antiaging and comfort. Silk pillowcase with natural antiaging properties. Hypoallergenic, smooth, soft, and breathable for a comfortable night's sleep. No wrinkles, hair and skin friendly. Helps prevent hair knotting and tangles, promoting a smoother look and a more restful night. May reduce facial wrinkles and irritation for delicate skin. The 100% lyocell back fiber provides grip to keep the pillow from slipping off the bed easily. Use scenarios Everyday sleep routine: enjoy smooth, breathable silk against the skin and hair, while its antiaging properties support a comfortable nightly routine. Poststyling care: use after hair styling to minimize frizz and tangling, with the back lyocell layer helping the pillow stay in place. Travel or guests: available in multiple sizes and colors to fit various pillows and settings, with durable construction that holds up to frequent washing.