From the gym cardio floor to training outdoors, the Suunto Dual Heart Rate Belt gathers heart rate data in any location with just one chest strap. Suunto's Dual Heart Rate Belt builds on the success of their tc-series Comfort Heart Rate Belt by adding dual technologies. The Suunto Dual Belt provides a snug and comfortable fit. It's made from textile material and utilizes unique traction straps to keep it in place. The seamless length adjustment and central closing mechanism also provide maximum comfort for a one-size-fits-all strap.