Canaian whisky is whisky that by law must be mashed, distilled and aged at least three years in Canada in a wooden barrel of not greater than 700 L capacity. Most Canadian whiskies are blended multi-grain whiskies and are usually lighter and smoother than other whiskey styles. They are often colloquially and generically referred to (and may legally be labelled) as "rye whisky" in Canada, though the US definition of "Rye Whiskey" would prevent lower-rye-content versions from being so labelled in the US. Although rye is often a primary component in Canadian whiskies, the use of rye is not dictated by legal standards. In converse, the US definition of "Rye Whiskey" does not have aging requirements, and younger (even Straight) US versions would not legally be labelled "Rye Whisky" in Canada.