Welcome to the forums, Finn! For swimming, I'd like to recommend the Underworks Swim Top, it binds great and just looks like neoprene. I have been able to swim at the gym and use it for kayaking, and both times have been great, with no restrictions in terms of movement, breathing, etc. I'm not sure how a regular binder would fare with continued water use, especially in a chlorinated pool, as even swimsuits can't stand that forever and they're made with that in mind, usually!