Thank you for viewing. I purchased this from the official website last August for 14,800 yen (16,280 yen including tax). I used it a few times indoors, but it didn't really suit me, so I stopped using it and stored it at home. It's in beautiful condition with no signs of use, but please check the photos carefully. Please understand that this is a used item, and if you are concerned, please purchase a new one. - Racbaki (RACBAKI) - Easy Sandal Anchor - Men's M (26.0-27.0 cm) - Level 8 for advanced users The following is quoted from the official website: Diet Support Shoes with a Unique Structure This product supports posture by aligning the center of gravity with a uniquely developed special structure. By improving posture, blood flow can be expected to improve, making it easier for the whole body to warm up and naturally leading to a body that is easier to lose weight. Corrects posture and center of gravity just by wearing and walking By wearing Racbaki every day, it encourages the body, which has become distorted, to be used correctly from the bones of the feet to the whole body. Racbaki guides the excess muscles that have become thick and developed due to the excessive use of muscles that don't need to be used because of the toe-centered center of gravity, naturally leading to a heel-centered center of gravity, resulting in a slender, straight skeletal structure.