ENHANCE YOUR BEAUTY SLEEP: Sleeping on our hypoallergenic, non-irritating satin pillowcase can also help your skin. As the friction of your skin decreases, while you sleep, you will experience fewer sleep wrinkles, which is equivalent to fewer wrinkles over time. NATURAL MATERIAL: The pillow cover utilizes 100% polyester satin to provide a resilient feel with a distinctive and lustrous appearance, which gives it a smooth finish and double-sided use. The pillowcase is a natural material and a skin-friendly choice. ENVELOPE CLOSURE DESIGN: When you sleep, no zipper closure will poke your face. The satin pillowcase does not have a zipper closure but uses an envelope closure design. When you are resting, the silky pillowcase can hold your pillow firmly in place. BEST FOR HAIR SKIN: Satin silk pillowcases can nourish the skin, increase the vitality of the skin's epidermis, and prevent skin aging. In addition, silk can keep your hair moisturized and healthy, and protect your hair from annoying tangles.