Klewenalp käse is a semi-hard cheese made from raw cow's milk, produced during the summer months by 15 alpine farmers on the Klewenalp in Central Switzerland. Each wheel weighs between 4 and 4.5 kilograms and contains at least 45% fat. The cheese is aged for 3 to 12 months, resulting in flavors that range from mild to very strong (rezent).