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The [[Heart Rate Monitor| Heart Rate Monitoring]] of [[Best Running Watch| Garmin watches]] is not as reliable as the Polar systems. The latest soft straps are better than earlier generations, but they can still be problematic. A worthwhile upgrade is to purchase a [http://www.amazon.com/dp/B007XCLU66 Polar Wearlink+ Replacement Strap]. The Garmin transmitter fits into the clips of the Polar strap, and you get a much better reading. There are two versions of the Polar strap, the [http://www.amazon.com/dp/B004RCLGHI/ Wearlink] and the [http://www.amazon.com/dp/B007XCLU66 Wearlink+], though the names are not used consistently. The Wearlink is slightly more comfortable and chaffs far less than the Wearlink+. The Wearlink+ is seems to last slightly longer, but I find it cuts into my skin on longer runs. The most obvious difference between the two is that the Wearlink has cloth electrodes that you can dampen, but and the Wearlink+ is slightly more reliablehas plastic electrodes (you still have to dampen your skin).
<gallery widths=300px heights=200px caption="[[Heart Rate Monitor]] Straps" perrow="3">
File:Garmin and Polar HRM Tx.jpg|The Polar and Garmin Heart Rate Transmitters, showing the similarity in connectors.