Everything is done to capture the excellence of terroir, 218 hectares, of which 160 are classified as Grand Crus. Each kept separate from picking until the must reaches the vats. The final assemblage is complemented by a component of reserves from the G.H. Mumm stocks to add maturity and richness. The wine is then bottled for secondary fermentation, followed by maturation under the G.H. Mumm cellars for at least three years before disgorgement and a complex liqueur de dosage.