Bests & Worsts Reviews from Amazon

After going thru 2 versions of Garmin and a Polar HRM&strap, this one finally works! I had been fed up with intermittent and erroneous heart rates, and no matter what I did (wet the pads, use electrode gel, etc.) there always would be crazy readings of 22 and even 222. This one worked fine right from the start. What's the difference between them all? This one has a shielding layer which mitigates the static electricity and interference that seemed to upset the other straps. It also has a 'polarity' - where you have the Right and Left side indicated as well as the shielding layer making contact to the skin. Garmin recommends to remove the transmitter module and wash in a regular washing machine after 7 uses, it would appear that a build up of sweat 'shorts out' the sensor pads and machine washing cleans up the salty sweat.