The basic ingredient used in Xellent, vodka is pure, top-quality Swiss rye. It is cultivated in the alpine foothills of central Switzerland, at altitudes of 500 to 800 metres, in fields no larger than two hectares. They use only the very best bread-quality rye. The varieties grown in this region are unusually resistant to disease and under constant supervision. The grain is harvested only when there has been relatively little rainfall and is then taken to a small country mill just a few hundred metres from Distillerie Willisau SA (DIWISA). There, it is washed and ground before being delivered to DIWISA. The quantity may be limited, but the quality is all the better for it.