What is the main characteristic of wines classified as 'Superiore'?

Wines classified as 'Superiore' are distinguished by their adherence to more stringent requirements regarding yields and alcohol levels. In Italy, the term 'Superiore' indicates that these wines must surpass standard regulations concerning grape production and wine composition. Typically, the regulations require a lower yield of grapes per hectare, which concentrates flavor and quality, and a higher minimum alcohol content compared to non-'Superiore' classifications. This classification is a mark of enhanced quality and is often used in conjunction with specific appellation laws, showcasing the winemaker's commitment to producing superior wines.

Other options describe characteristics that do not define 'Superiore.' For instance, being estate bottled or originating from high-altitude vineyards may apply to some wines but is not a general requirement for the 'Superiore' designation. Additionally, the aging requirement for 'Superiore' wines is not universally set at five years, making it a misleading characteristic for this classification.