I have both hard straps and soft straps for my Polar HRM and my Garmin Edge 705.
Yep... straps come in diff sizes, I have a small. I'm 34D bra also. I just tuck my strap up under the edge of my bra band. And yep yep... the soft strap for both products, unfortunately, does not perform as well or long as the hard ouchy strap.
OK, besides running water over the electrodes before you put it on to pick up the heart rate... the wet makes the contact... you need to remember to rinse it in clear water (no soaps) AFTER you use it... to cleanse it... hang up / drip dry.
I've helped many peeps at my gyms, and have personal experience as well, of straps not working because the dried sweat crystals are clogging things up. This was at the advice of a service tech when I called in for help because my unit wasn't working properly.
Good luck, hope you get some resolve.



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