Wake up to visibly plump, glowing and intensely hydrated skin with Medik8's two-step overnight treatment mask. H.E.O. Mask takes a fundamentally scientific approach to optimal maximum skin moisturization to deliver clinically proven skin hydration, moisture retention and barrier support - both instantly and over time. The three key pillars of moisturization - humectants, emollients and occlusives (H, E and O) - are combined in an expertly optimized ratio to dramatically improve the appearance of dryness, dullness, fine lines and wrinkles while you sleep. Your most supple-looking skin awaits. Multi-Weight Hyaluronic Acid H.E.O. Mask uses multiple molecular weights of hyaluronic acid (small, medium and large), to distribute deep hydration evenly throughout the skin's many layers. This leaves the complexion visibly nourished and supple. Natural Moisturizing Factors (NMFs) A unique combination of natural components in your skin (sodium PCA, glycerin, urea, proteins, sugars, 15 different amino acids, lactic acid, and creatine) which bind and hold moisture for optimal skin hydration. Ceramides Naturally found in the skin barrier, ceramides are essential for helping the skin to retain moisture while supporting its natural protective shield. Squalane An almost skin-identical lipid, squalane helps to replenish the skin’s natural moisture barrier while deeply moisturizing the complexion. Glycerin A natural humectant, glycerin attracts water to the skin to leave it hydrated, comfortable and visibly supple.