The inner material is made of silk and the outer material is hemp organic cotton, and it has a two-layer hie-removal function. There are many hietori kutsuunder that are worn in layers of 2 or 4 pieces, but they are combined into one pair with a two-layer system, and it has become a hie and kutsu that combines the functionality and goodness of the material. Silk is composed of 18 kinds of amino acids that are close to human skin, and is a natural animal material with high detoxifying properties, breathability, heat retention, cool in summer and warm in winter, and excellent humidity control. The outer yarn of 55% hemp hemp × 45% organic cotton is created by the porous nature of hemp, and in addition to its breathability, heat retention, cool in summer and warm in winter, and humidity control, it has a soft, soft texture, and durable texture. The moist silk texture when you put your feet on and the thickness and texture of the material due to the double structure gently wrap your feet. The use of polyester threads on the inside that connects the front and back makes it highly elastic and durable. In addition, the rubber at the mouth is gentle and difficult to squeeze even during a good night's sleep. Whether it is used as a good night socks or on a daily basis, it is not stuffy and has a refreshing feel. It was manufactured at the Kutsushita factory on Awaji Island. Yin and Yang (silk animal / cotton linen vegetable) 2-layer system, please try it.