Why do you need to replace your pillowcase?Because mulberry silk doesn’t collect dust or cause dry skin like cotton and other fabrics, imagine having your hair slide across a pillowcase instead of getting all tangled and messy by the morning... Winssy provides the Top quality mulberry silk, which is soft and delicate, skin-friendly, smooth, low-friction, hypoallergenic, antibacterial, moisturizing, reduces skin wrinkles, keeps hair frizz-free, and other advantages. Silk Pillowcase Description:Pillow Size:  20" X 36" (50cm X 91cm)Pure silk NO special smell22MM thickness silk completely opaqueGood dyeing silk no color loss after washing Envelope design more durable than zipper Machine washable (Recommended to put in laundry bag first)Ironable silkShip from the USAMoney back guarantee 60 daysSGS, OEKO certified