Sumak rugs (Soumak) – This construction technique produces a flat-weave rug that is thick, strong and exceptionally durable. Unlike kilims, Soumak rugs are not reversible because non-clipped yarns are left on the back. However, they are also stronger than kilims. Antique Sumak carpets are unique because the wefts are used to produce decorative patterns rather than as a structural element. Antique Soumak rugs are generally very finely woven and feature richly detailed motifs. Traditionally, these spectacular flat-weave carpets are decorated with ancient symbols, tiny birds and geometric animals. Many of these geometric patterns and tribal symbols are associated with the Shahsavan tribe. In the 17th century, these influential warriors served as the personal bodyguards to Shah Abbas according to historic legends. The Shahsavan, who used Soumak weaving techniques widely, inhabited modern-day Azerbaijan and parts of Northwest Persia near Ardabil.