Soothing, Softening Thermal Spring Water. The Thermal Spring Water is at the heart of most of La Roche-Posay's products. Its unique combination of mineral salts and trace elements has been scientifically demonstrated for its soothing properties and used in Europe for centuries. Contains a high concentration of Selenium, a powerful natural antioxidant. Mineral-rich micro-droplets provide immediate, intense soothing. Gentle, fine mist of micro-droplets. Last step in cleansing, first step in caring, to tone and refresh skin.