I have kept this at home without using it. It is new and unused, but the box has scratches. Please understand. The box has scratches, but it is unused. Pectoral Muscle Training This product targets the pectoralis major, one of the muscles that make up the chest. When you move your arms forward, the fabric's resistance adds load, increasing the activity level of the pectoralis major. The fabric with different stretch ratios naturally opens the chest when worn, supporting correct posture. New, unused, unopened. Purchased for 19,580 yen. Women's short-sleeve top Please refrain from purchasing if you are seeking perfection.