The Slip Pure Silk pillowcases are made from Slipsilk, a fabric developed over more than ten years to ensure softness, durability, and a smooth surface. They are designed to maintain skin and hair hydration while sleeping, while also reducing friction. The pillowcases have been shown to absorb less facial cream compared to cotton ones, allowing products to stay on the skin. Dermatologist recommended, these pillowcases help improve skin appearance and minimize wrinkles.