A kilim (Persian: gelīm) is a flat tapestry-woven carpet or rug traditionally produced in country of Iran. Kilims can be purely decorative or can function as prayer rugs. Modern kilims are popular floor-coverings in Western households. Another flat-woven weaving technique is known as Soumak. This weaving technique involves a more complex looping of the wefts in various configurations producing a thicker, more textured cable-like surface on the Soumak rug. Flat woven rugs are generally thinner and more lightweight than pile rugs, almost like heavy fabrics, although soumaks are somewhat heavier. Persian kilims and soumaks tend to be woven in highly abstract bold, graphic geometric rug designs and patterns rather than in curve linear patterns.