From the Sierra Nevada Brewing Co. website: Our ESB combines the best of English tradition with West Coast style. A blend of malts featuring British-grown Maris Otter is balanced with the earthy spiciness of hand-selected English and US hops. The ale is left unfiltered, which enhances mouthfeel and hop aroma creating a slightly reddish-copper hue http://www.sierranevada.com/