SilkSlip 100% Pure Mulberry Silk Pillowcase with Cotton Underside and Hidden Zipper for Hair and Skin, 19 Momme 400 Thread Count Hypoallergenic, Queen(20x30 Inch), Chocolate Style: The upside is made of 100% 19 momme pure and natural mulberry silk, incredibly soft, smooth, and light weight. The underside of the pillowcase is crafted by 100% pure cotton fabric to anti-skip on the mattress. Benefits: Hypoallergenic and naturally dust-mite resistant, making them perfect for those who suffer from a range of allergies, and aid with the natural care to skin, prevents wrinkles. The smooth texture of silk pillowcase helps prevent hair split and morning head, making you wake up in the morning every day with soft & gorgeous hair. Closure: Big opening and longer hidden zipper for style, comfort and better fit the pillow into the pillowcase. Each silk pillowcase is handmade and shows top-quality workmanship. Size: 20 x 30 inches (50 cm x 75 cm) , fits most queen sized pillows OEKO-TEX Certified (Standard 100) to be free of chemicals and naturally dyed with no color shading or fading.