Protos, a renowned winery in Spain’s Ribera del Duero region, offers several red wines aged in barrels, including Protos Roble, Protos Crianza, and Protos Gran Reserva. These wines are crafted primarily from the Tempranillo grape, with varying aging processes in French and American oak barrels, creating wines with rich, velvety textures and complex flavors of ripe red fruits, blackberries, licorice, and subtle oak nuances.