There is a theory that the name comes from the work of Thornton Wilder, "The bridge of Saint Louis King," which was popular at the time. Anyway, it seems more likely that the origin of the brand name is related to the population of San Luis, in the heart of the Vuelta Abajo producing region, which is particularly famous for the layer sheets produced there.

They are made with a bound composite sheets from the regions of Vuelta Abajo and Semi Vuelta.