It's an important distinction as not all wine clubs offer only Estate Bottled selections. Estate bottled wines are produced and bottled at a winery from grapes grown in the winery's own vineyards, or in vineyards under their long-term control. This stands in contrast to many lesser quality and mass produced wines made by wineries that purchase grapes each year on the open market. Estate bottling ensures the winemakers have the oversight necessary to most fully develop their grapes' varietal character and decide the perfect time for harvest. It also ensures each wine produced by the winery has a distinct and consistent sense of place, or terroir, that reflects the soil and climate of its specific region of origin.