I have kept this at home without using it. It is new and unused, but the box has some scratches. Please understand. 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 varying degrees of elasticity, naturally opens the chest when worn, supporting correct posture. New, unused, and unopened. Retail price: 19,580 yen Women's short-sleeve top Please refrain from purchasing if you are seeking perfection.