This is my second purchase of Under Amour Mid sports Bra. I still like it and thinking to order another one. It's thin, breathable and doesn't show under thin T-shirt, it's maybe because I got the black color. It's very comfortable, I can wear it all day. I just don't like the big logo on the under chest band. I do practice Karate and running, the bra still hold well. I like the material its soft and comfortable, not easy get loose like other sport bra I have. I'm 5'6" and 135 pls, my bra size is 34B, and a Medium fits perfect. Highly recommended.