Classifications of Vodka

There are no uniform classifications of Vodka. In Poland, Vodkas are graded according to their degree of purity: standard (zwykly), premium (wyborowy) and deluxe (luksusowy). In Russia Vodka that is labeled osobaya (special) usually is a superior-quality product that can be exported, while krepkaya (strong) denotes an overproof Vodka of at least 56% ABV.
In the United States, domestic Vodkas are defined by U.S. government regulation as "neutral spirits, so distilled, or so treated after distillation with charcoal or other materials, as to be without distinctive character, aroma, taste or color." Because American Vodka is, by law, neutral in taste, there are only very subtle distinctions between brands. Many drinkers feel that the only real way of differentiating between them is by alcohol content and price.