A high percentage of malted wheat is used (by German law must be at least 50%, although it may contain up to 70%), with the remainder being Munich- and/or Vienna-type barley malts. A traditional decoction mash gives the appropriate body without cloying sweetness. Weizen ale yeasts produce the typical spicy and fruity character. Too warm or too cold fermentation will cause the phenols and esters to be out of balance and may create off-flavors. A small amount of noble hops are used only for bitterness.