These are environmentally friendly socks made by combining the upcycled material "Looplus", which recycles scraps and knitting scraps generated during sock manufacturing, and washi paper yarn, which has excellent moisture absorption and release properties. Washi yarn has the property of absorbing and releasing moisture, making it comfortable in sweaty situations such as summer when it is stuffy or when running or outdoors. This pair combines the eco-friendliness of upcycling and the functionality of washi yarn. The main body is made of upcycled yarn "Looplus", which is made from recycled fibers generated during the manufacturing process of socks, and the surface that touches the inner skin is knitted with Japanese paper yarn to achieve a smooth and comfortable fit. This makes the socks both highly functional and comfortable while reducing environmental impact. In addition, it has high functionality that can be used in a wide range of situations, from sports to outdoor activities and everyday use, and the washi paper yarn used on the back side wicks away moisture to keep it dry, and the overall support knitting provides an excellent fit. The instep has a mesh structure to increase breathability, and the areas with large friction such as the kakatoe, toe, and Achilles tendon are reinforced with nylon thread to improve wear resistance. In addition, the Y-heel structure that wraps around the kakato and the Y-toe structure that reduces the burden on the fingertips make the pair a pair that pursues ease of movement and comfort.