The Suunto Smart heart rate belt provides accurate heart rate data while remaining comfortable to wear. The strap's efficiency is unbeatable, especially for sports where hand movements interfere with wrist-based heart rate measurement, and allows heart rate measurement even when the watch is worn over the sleeve or attached to the bike handlebars, or when the watch is not worn at all during a workout.

The Suunto Smart heart rate belt has an R-R memory that is used when the watch is not in range of the Bluetooth smart radio. This is super for team sports, for example, as it allows recordings to be made without wearing the watch. The memory function is supported by the Suunto 3, 5, 9, Spartan, Ambit3 and Traverse watches.

Avid cyclists, team athletes, martial artists, climbers, swimmers, water sports enthusiasts, triathletes, ski mountaineers, cross-country skiers, inline skaters and gym fans can get the most benefit from using the Suunto Smart heart rate strap.

The Suunto Smart heart rate strap is also a great companion for the free Sports Tracker app with Android, iOS and Watch OS devices.

The strap that comes in the package is black, size M. You can also buy a spare Suunto chest strap, available separately in sizes S, M and L.