Polar Loop wristband tracks activity, exercise and sleep alongside an iPhone app for $109

We've tested our fair share of activity trackers and Polar is now adding one more to the fray. That's not a Nike+ FuelBand you see, it's the Polar Loop: a wearable for your wrist that keep tabs on activity, exercise and sleep patterns. Touting the "first waterproof" gadget of this sort, the company says the device can discern between activity levels, with alerts and motivational feedback along the way. The Loop syncs to Apple smartphones via Bluetooth with its companion app, Polar Flow. Similar ...