It's a size M! (Description) I bought this before joining a gym, but when I actually went, everyone was dressed casually, so I haven't had a chance to wear it, and I'm putting it up for sale ( ; _ ; )/~~~ ✴︎Features The feminine sheer material and the fake layered design with a back-style tank top enhance the femininity while also creating a voluminous bust. The wider underbust distributes the power, providing a comfortable hold that isn't too tight. It's comfortable and doesn't slip, even during vigorous movements. It has built-in, non-removable bra cups, so you can wear it on its own. ⚠️Pads cannot be removed. ✴︎Materials 81% Polyester, 19% Polyurethane Mesh: 95% Nylon, 5% Polyester