The main body material is a high-density nylon twill that uses 210d for the warp and 420d for the weft. Because it is woven at high density, the fabric has a firm feel, and because it has a moderate luster, it has an elegant look. It is a high-density nylon twill fabric with a water-repellent finish. The attached leather is shrink leather using the raw leather of Japanese black beef. To bring out the softness of the skin of Japanese black beef, we tan it with vegetable oil and tannins, and add more dye. It has a fine-grained semi-aniline finish to give it a gentle color that cannot be obtained with dyes alone, which gives it some water-repellent and antifouling effects. By milling for 8 to 10 hours to give a natural texture by embossing, the leather has a nice texture and taste.