NIGHT Hyaluronic Acid Sheet Mask delivers a concentrated dose of skin-loving ingredients: powerful hyaluronic acid PLUS the age-fighting power of silk protein. Powered by natural silk: our proprietary natural silk supercharges the effectiveness of key ingredients like hyaluronic acid, boosting moisturizing power creating bouncier more hydrated skin. 2x serum: you'll notice that our sheet masks contain plenty of hyaluronic acid-rich goodness, which can be applied to your neck and chest after each use.