The city of Heriz has long been famous for rug weaving. Although Mongols invaded Iran in the 13th century, Heriz rugs retained much of their traditional weaving style, which had developed long before invasion. Like most tribal Persian rugs, Heriz rugs were first woven for utilitarian purposes and used as wall coverings or were placed on floors for warmth. Even today in some parts of Heriz, rugs are the main source of a family's income, and are still traded for everyday supplies in the marketplace.
Heriz rugs are popular among designers for their soft earth tones and vivid patterns, largely geometric.
Most have a large rectangular medallion in the centre of the rug, and sometimes have a leaf or plant motif in the background and along the borders. The weavers use double outlining on the motif, which gives the patterns a bold look. In some Heriz rugs there are dragons woven into the corners or background of the rug.
Natural dyes from vegetables or plants are used for coloring. Rust and beige are the predominant colors in many Heriz rugs, along with others, such as black, green, light blue, and ivory. The colors are balanced and rich, and many rugs have complimentary earth tones in the background.
Turkish knots are the most common, although Persian knots are used in cities like Ardabil. The rugs are made of wool and cotton, and occasionally goat hair. In rare cases silk is used with the wool. Heriz rugs are known for their sturdiness, made of heavy cotton and dense wool. Smaller size Heriz rugs are unusual.
Generally knot sizes are large, giving relatively low KPSI figures. This, however, does not affect their value, which is usually at the higher end among tribal rugs.