The HRM-Swim is designed specifically for pool workouts, featuring a non-slip surface to ensure the band stays in place. The monitor itself has a compact design ensuring minimal drag through the water and can store up to 20 hours of heart rate data during your swims. When you're out of the water you can sync with the Garmin Forerunner 920XT, Fenix 3 and Epix watches.
Essential reading: Best heart rate monitors
The HRM-Tri, as you probably guessed, is aimed at triathletes, capturing heart rate data during every part of the workout. It's the smallest and lightest of Garmin's heart rate monitors and can provide advanced running dynamics, including cadence, vertical oscillation and ground contact time. Compatible devices in the Garmin family include the Garmin Forerunner 920XT, Forerunner 620, Fenix 3, Fenix 2 and Epix.
Garmin's EMEA product manager for fitness, Andrew Silver said: "The HRM-Tri and HRM-Swim add another level for triathletes and swimmers, offering them the most comprehensive data to help them train for and achieve their goals."
The HRM-Tri will last up to 10 months on its battery while the HRM-Swim has up to 18 months of use, with both batteries being user-replaceable. Both can be used with the brilliant and comprehensive Garmin Connect software to analyse your heart rate graphs alongside lots of other fitness metrics including pace, strokes and SWOLF for swimmers.
The HRM-Swim costs $99.99 and the HRM-Tri is a little more at $129.99. You can get both in a bundle for $199.99 or even fork out $599.99 for the special edition Forerunner 920XT Tri Bundle, offering both HR monitors, the Forerunner 920XT and a quick release kit.