Garmin HRM2 Premium Soft Strap
I could never get this strap to work reliably. Wear any kind of synthetic clothing and it flat lines at 70-90 bpm. Exercise indoors or in summer heat resulting in a good healthy sweat, and it will stop working with the same flat line at some random number. Dry off underneath, have it work for another couple of minutes. I have had much better luck with the old design, even though not nearly as neat and comfortable, it at least works ~80% of the time. Still not great, but much improved. This strap's design is