At Vega Sicilia, the oak cask is an essential part of the vinification, forging a true consortium with the wine. In the same way that the grape is an achievement of the vineyard itself, it is essential for Vega Sicilia that most of the casks are coopered at the winery itself. On a section of the estate, Vega Sicilia operates a small cooper's workshop, which not only repairs and reconditions but also makes fresh casks with new American oak. The wood is left to dry for at least three years, two in the open and one under cover. Following it's vinification, Unico Cosecha is matured up to ten years in a combination of seasoned and new, oak casks and large capacity wooden vats.