Fermentis Safale K-97 is a German Ale yeast selected for its ability to form a large firm head when fermenting. Suitable to brew ales with low esters and can be used for Belgian type wheat beers. Its lower attenuation profile makes for beers with good mouth feel. This ale yeast works at a wide temperature range between 12-25â (53.6-77â) but ideally between 15-20â (59-68â). Highly flocculant.