A kolpik is a type of traditional headgear worn in families of some Chassidic rebbes (Hasidic rabbis), by unmarried children on Shabbat, and by some rebbes on some special occasions other than Shabbat or major holidays. The kolpik is made from brown fur, as opposed to a spodik, worn by Polish chassidic dynasties, which is fashioned out of black fur.
It is seen as an intermediate level garment between Shabbat and weekday dress.
The days that some rebbes don a kolpik include:
Rabbi Shaul Shimon Deutsch, the Lyozner Rebbe in Boro Park wears a kolpik on Shabbat, following a previous minhag of the Rebbes of Chabad.
The word originated from a Turkic word for this kind of hat, kalpak, (also spelled calpac).
Joseph Margoshes (1866–1955) in his memoir A World Apart: A Memoir of Jewish Life in Nineteenth Century Galicia writes regarding Rabbi Shimon Sofer's election to the Imperial Council of Austria:
The election of the Krakow Rabbi to the Austrian Reichstag made a tremendous impression on the entire Jewish world, ... It gave them enormous pleasure to see even a single Rabbi achieve the major honour of sitting among so many great personages, clad in a fine calpac amid such esteemed gentlemen. The poor things did not know that the calpac was part of historic Polish dress, and that many Poles, especially extreme nationalists, would wear these same calpacs at their meetings.