BEAUTY SLEEP No more sleep lines, superior moisture retention and less wrinkle development over time. Lunar Silk Pillowcase protects your facial elasticity and moisture barrier, while your current pillowcase absorbs your moisturizer and dries out your skin. Moisturizers will stay on your face where they belong. Mulberry Silk is a natural protein based fiber that works while you sleep by promoting serotonin and collagen restoration. 22momme is breathable and just the right thickness for comfort.