Restore the moisture levels of youthful skin with Hydra Summum Serum. Water in your skin is vital in order to keep it looking young and beautiful however with age moisture levels decrease and the skin becomes dull and uncomfortable. This Serum from Guinot restores your skin to its youth by boosting the skin's hydration mechanisms, it forms a barrier to limit transepidermal water loss, binds water to your skin and improves water distribution from the dermis to the epidermis.