The Russian Czars, in their quest to dull the pain of... being in Russia, perfected an exclusive vodka-making technique wherein the elixir's impurities are frozen out.
Sort of. This "freeze-filtration process" is fairly complicated, time-consuming, and expensive, but if you're a vodka enthusiast, it's worth it.
Stolichnaya has updated the method and taken it one step further by filtering the already pure alcohol through a Z-carbon filter, which was apparently rare in the 16th century. The result is Elit, an extremely smooth luxury vodka that goes well on the rocks.