grade material: The pillowcase features a front side of 19 Momme silk with a 600 thread count and 6A class fabric, designed to be 100% safe and gentle on delicate skin. The back side is 100% breathable Loycell, woven super tightly for ultimate protection, breathability, and comfort, helping to prevent slipping all night. Natural benefits: Silk is a natural antiageing material that is gentle on skin. The skinfriendly fabric manages moisture to feel cool in summer and warm in winter, and can help prevent hair from knotting and matting while reducing facial wrinkles. Benefits for hair: Reduces friction against hair strands for smooth, frizz, hydrated hair and less bed head. Its properties help maintain a comfortable temperature all night, with a cool surface in summer and a warm surface in winter. Envelope opening design: The reverse side features a cross opening for easy removal and replacement of the pillow core, and to prevent scratches from the zipper. Care and maintenance: Machine washable at 30 C using mild silk detergent. Tenestar is recommended for both machine and hand washes. Air dry and cool iron. Use scenarios: Everyday sleep routine to protect skin and hair during nightly rest. Suitable for hot summers and cooler winters due to temperature regulation of the fabric. Ideal for curly hair care to reduce frizz, knots, and breakage while maintaining hair health.