Optimal Ratio Moisturisation Two-Step Overnight Mask 2 x 50ml Wake up to a deeply hydrated, supple and visibly glowing complexion with H.E.O. Mask. Medik8's pioneering 2-step overnight mask takes a scientific approach to maintaining long-lasting moisturisation, incorporating all 3 of the fundamental elements for ensuring optimal skin hydration: humectants, emollients and occlusives. H, E and O are expertly combined in an optimised ratio to offer the ultimate, bi-weekly treatment for dry and dehydrated skin. H.E.O. Mask is clinically proven to deliver lasting hydration for up to 72 hours after use,(1) improving the appearance of dryness, dullness and fine lines and wrinkles - both instantly and over time. The advanced formula also works to strengthen the skin barrier, supporting optimal moisturisation and preventing TEWL (transepidermal water loss) for 72 hours.(1) In addition, H.E.O. Mask is dermatologically tested and non-comedogenic. Key Benefits: - Delivers 72 hours of lasting skin