I got the medium size, but the rubber band's fit under the chest felt too tight after a while. I felt a lot of pressure and had to take it off. The same thing happened another time. I don't know if I will try it again. It's expensive for what it is, since the size doesn't correspond correctly. It fits more like a small than a medium. It will be a waste.

Very tight, not comfortable, puts too much pressure on the elastic to the point where you have to remove it after a while, expensive to go to waste!