Sajkaca is a traditional Serbian male cap, made from thick fulled wool felt, with a distinctive square shape that resembles a V when viewed from above. It first appeared in the first half of the 19th century among soldiers of the Sajkas Battalion in Vojvodina (from which it gets its name), and by the start of the 20th century it had become part of rural attire throughout Serbia.

During World War I the sajkaca became part of the standard uniform of the Serbian Army and a symbol of national resistance. After the war it became an integral element of the Serbian folk costume, and today it is worn at festive occasions, slava family feasts, folk dance performances and cultural events.

The cap is made by Etno radionica using a traditional method: wool is carded, spun, fulled in hot water, and then cut according to a traditional pattern. The standard colour is dark grey or black, with a flat brim. The cap is durable, resistant to cold and damp, and can last decades with proper care. Store in a dry place; clean only with a clothes brush — do not wash with water.