This bra has absolutely no metal hardware (hooks, underwire) that might interfere with TSA airport screening. I got tired of being stopped for secondary screening due to wearing an underwire bra or even a bra with metal hooks. I prefer a bra with more support than this bra offers; however, it works fine for a travel day. I wear a 36B and the medium size was a bit tight. If I planned to wear this bra more often, I would probably go up a size.