100% Ruché. 

From the importer: "The grapes are destemmed with berries kept whole and gently pressed without breaking the skins, just enough to kick off fermentation in vat. Fermentations can be very lengthy in this cold cellar, where there is no addition of yeasts or sulfur and no temperature control; maceration is often as long as two months. The wine ages on its lees for a few months before being bottled without fining or filtering and with only a gram or two of sulfur if any. Mama Maria Teresa's middle name and artistically rendered visage with her signature sunglasses and sunhat grace the label of bottling."