Kâld Kletske Opfrieser is a blonde ale at 7% ABV, brewed by Brouwerij Dockum in the Frisian town of Dokkum. This beer emerges from a collaboration with Sonnema and is part of the 'Opfriesen' campaign by Visit Friesland. The brewery restores a historic brewing tradition in Dokkum, where up to nineteen breweries operated in the early medieval period.

The Opfrieser is fresh and spicy, with warming notes from the berenburg liqueur. It reflects Kâld Kletske's approach: craft-brewed specialty beers that are distinctive yet approachable in character.