Imperial IPAs (also known as Double IPAs) are distinguished by their prominent hop cone aromas and flavors, and bitterness that is intense and assertive. Colors range from deep gold to deep amber. These intense hop characteristics should be balanced by a rich malt backbone, mid-to-high levels notes and fruity esters. They are medium-to-full bodied in weight and notes of astringency and hop haze are accepted. Depending on the varieties of hops being used, the drinker can experience a wide range of hop flavors including tart citrus peels, pepper and earthy pine-like notes. Imperial IPAs have an ABV between 7.5 and 10.5 percent. These ales represent an extreme use of the hop flower in brewing and a challenge to the brewer in terms of balance and drinkability.