The longer the rush grass, the higher the quality. The rushes are reddish brown at the tip, white at the base, and blue (green) in the middle. We use Japanese rushes (produced in Yatsushiro, Kumamoto Prefecture). Each strand of Japanese rush grass is thicker, with a thicker outer skin and finer fibers, making it more resilient and durable. Rigusa has the characteristics of purifying the air, regulating humidity, and being stain resistant. Hiba essence, extracted from hiba trees in Aomori Prefecture, is processed on the surface of the fabric using the manufacturer's proprietary technology. Hiba essence contains Hinokitiol, a natural substance with extremely high antibacterial properties. (It has an antibacterial and deodorizing effect compared to untreated products.) Both sides of the front and back can be used, making it economical. Because it is a natural material and craftsmen process each item by hand, there may be slight variations in shape and the size may differ slightly from the size shown on the label. Please understand this.