Adidas Heart Rate Monitoring Smart Bra This adidas smart bra features exclusive heart rate sensing technology knit directly into the fabric, no chest strap required. Knit-in heart rate sensing fabric accurately and comfortably captures heart rate data during your workout. Smart HRM Bra features seamless technology and double-layer construction to deliver a second-skin fit and reduce chafing. Use with your favorite heart rate monitor (HRM) pod to track your heart rate and reach your fitness goals. Compatible with snap-on transmitters from leading technology brands, e.g. Polar, Garmin, Runtastic, Wahoo Fitness, Zephyr, etc.