A tres leches cake (translation: three milks cake) is a sponge cakeāin some recipes, a butter cakeāsoaked in three kinds of milk: evaporated milk, condensed milk, and heavy cream. When butter is not used, the tres leches cake is very light with many air bubbles. This distinct texture is why it does not have a soggy consistency, despite being soaked in a mixture of three types of milk. Learn more on Wikipedia