Water makes up a large proportion of your skin. Hydrators bind water to the skin (as opposed to moisturisers, which add oil). Dehydrated skin, which usually feels dry and tight, lacks water. Treat it with a specialist hydrator that delivers water to the skin using humectants – water-loving ingredients that draw moisture to the skin’s top layer. Hyaluronic Acid is a great example. Look out for it in different types of skincare products, including serums, face masks and night creams.