Uriage Thermal Water is naturally isotonic, it simply respects the integrity, size and shape of the skin cells. Thus, there is no need to pat dry and also acts as a make-up setting spray. Simply spray a mist on the skin after cleansing or over make-up and let it work! Uriage Thermal Water is truly active: moisturises the skin for up to 3 hours, soothes and protects it from free radicals, which is an age accelerating factor.