Imperial porters are dark brown to black in color and range in alcohol from 7-11%. Fruity esters should be evident but not overwhelming, and should be balanced with malt sweetness and low-to-medium hop bitterness. Roasted malt provides a majority of the flavor for this style, which has been popularized by American craft brewers in the last 30 years. Noteworthy examples of this style include: Full Sail Imperial Porter, Southampton Imperial Porter and Flying Dog Gonzo Imperial Porter.