After I wrote my review of the Basis B1 fitness-tracking wristband, the people at Polar reached out and asked me if I would like to try the Polar Loop. It’s a relatively new, $99 device that tracks steps, calories, sleep and other activities, as well as heart rate with an optional device such as Polar’s H7 Heart Rate Sensor. The Polar Loop competes with the Fitbit Force, the Jawbone UP and UP24 as well as the Withings Pulse and even the Basis B1, although the B1 is twice the price of the Polar Loop.