This is compression innerwear for the upper arms. Simply wearing it will firmly tighten the areas around your upper arms, supporting a sleek, slimming silhouette. Made with stretchy material, it's comfortable to wear for long periods without feeling too constricting. You can use it in various situations, such as everyday outings, work, or light exercise. In addition to shaping your upper arms, it also helps you naturally become more aware of your posture. The simple black design makes it discreet when worn as an undergarment. Color: Black Size: M (Sleeve Length: 24-30cm / Shoulder Width: 36-43cm) Instant purchase is OK.