Slip Pure Silk 360 Thread Count Peony Silk Pillow Case, King, The beauty secret of celebrity hairstylists, dermatologists and beauty experts. THE SlipSILK DIFFERENCE: Slip pure silk products are made using slipsilk, developed and refined for over ten years to provide the ultimate combination of shine, thickness, softness and durability. ANTI AGING: We spend a third of our lives in bed. In laboratory testing, slipsilk pillowcases were shown to absorb significantly less face cream than cotton pillowcases, so they can help keep your skin's moisture and valuable face and hair products where they belong, on your face and hair.