Soumak rugs or Sumak, construction technique is flat-weave. They are strong and exceptionally durable. Unlike kilims, Soumak rugs are not reversible because non-clipped yarns are left on the back. The wefts are used to produce decorative patterns. Are generally very finely woven and feature richly detailed motifs. Traditionally, these spectacular flat-weave rugs are decorated with ancient symbols, tiny birds and geometric animals. Many of these geometric patterns and tribal symbols are associated with the Shahsavan tribe.