XO TRÉSOR is a blend of around one hundred eaux-de-vie selected for their characteristic of finesse while possessing great power, richness and length. These eaux-de-vie are all Grande Champagne 1st growth, and all three major grape varieties (Ugni Blanc, Colombard, and Folle Blanche) are represented. Aging is for more than two generations (50+ years) in precious Tiercons barrels, famed for their age and rarity.