Sanada-himo, woven flat with warp and weft threads, is said to be the narrowest textile in the world. In the tea ceremony world, it is considered a secret cord, representing the head family through only its pattern, color, and line thickness. During the Warring States period, due to its strength, it was used in various ways, such as for fastening samurai armor or tying up portable luggage. Its characteristics include soft colors, a textured surface, and its durability.