I have not used the headset while swimming so have no comment in that regard. I have found it very enjoyable to use (the sound is excellent) while hiking and skiing. My major concern is that , unless you have the controls around your throat (which is uncomfortable), it is difficult to make any adjustments 'on the fly'. I have also found that, on occasion, sound only comes out of one side, necessitating the removal of the headset and resetting the control. This has not happened often but is a nu...