Genuinely thought when I took it out of the packaging that there was a thin piece of cardboard or something with it, but there wasn’t! The bra itself is made of really thick material and has little to no stretch at all. It was quite difficult to get on and off. Once on it felt comfortable and very supportive, good for running but not sure how easy it would be to get off after sweating a bit. I don’t feel that I needed a bigger size as once on it felt fine, just getting it on was the issue due to it being so thick and having no stretch!