If the glory years of the Burlington Railroad began in 1934, with the Burlington Zephyr's phenomenal Dawn-to-Dusk run, surely they culminated in 1949, with the arrival of the California Zephyr.

The HxM™ BT combines Zephyr’s patented BioHarness™ smart-fabric heart rate technology used in high-end professional markets, with speed and distance in a small, comfortable consumer device.