I think it's more about the bra than about the strap. I'm small but floppy, plus I run, so we probably aren't wearing the same bras. But all the bras I wear have some space between the breasts and above the band where my HRM modules fit just fine, both the old style Garmin hard strap and their new HRM-Run (which the newer style straps seem to chafe intolerably for anyone with a prominent xiphoid, but that might be a problem unique to runners, and IAE a little tape over the sharp edge fixes that).


Just to add something else into the mix: http://www.dcrainmaker.com/2015/01/a...-activity.html - but it's Bluetooth only.