"Now it's Nuuk." The pun on Jesper Tønnesen's caps, where Greenland's capital Nuuk alludes to the Danish word "nok" (enough), has led to strong sales.
The design also includes a nod to Trump's MAGA caps with the slogan "Make America Go Away".
Sales took off after Danish TV 2's correspondent shared a picture of the cap.
"During the weekend we sold 80 caps in the store and we could have sold 1,000. But we didn't, because we don't have any more left," says Jesper Tønnesen, who runs a clothing store in Copenhagen, to DR.
More caps are on their way to Denmark and Greenland. The new ones, in white or black, feature a Greenlandic flag and the text "Already Great".
Any profits will go to vulnerable Greenlandic children.
