The ISOI Moisture Doctor Toner is a water-type toner designed to boost hydration post-cleansing, featuring ingredients like sodium hyaluronate, hyaluronic acid, and ceramides that work to enhance the skin's moisture barrier and provide deep hydration. It also includes natural extracts such as tea tree-derived ceramides, melaleuca alternifolia, and houttuynia cordata to soothe and calm sensitive skin.