At 510 and 180lbs the 334 fit me fine around the waist. They were a bit clingy in the front and back though. They are also a bit thin so, even wearing underwear with them, be prepared to feel on display. I definitely wouldnt wear them in the water. No line so youll definitely want underwear. They do dry fast though, but again if you're wearing underwear with them the quick dry properties are wasted since your underwear are still wet. If you aren't wearing underwear when you get them wetwell you're a braver man than I.