This product is a shoulder posture correction belt. Adopting high quality material, which is soft, breathable and comfortable to wear.
It can help you correct poor posture and stand straighter to make you look better and feel younger.
Material:OK Cloth, SBR, Nylon
Size:Suitable for bust 70-120cm/27.56”-47.24”
About the difference between A1 and A2：
A2 is thicker and wider than A1.