Sanjaku obi , is a type of men's obi. It is named for its length, three old Japanese feet about 37.9centimetres (14.9in)). The obi is sometimes called simply sanjaku. During the Edo period it was popular among the people as the obi for yukata-like kimonos because of its ease of use. According to some theories, the sanjaku obi originates from a scarf of the same length, which was folded and used as a sash. A sanjaku obi typically is shaped like a kaku obi, narrow and with short stitches. It is usually made from soft cotton-like cloth. Because of its shortness, the sanjaku obi is tied in the koma musubi, which is much like a square knot.