Most fitness trackers do not meet the needs of swimmers because the water interferes with their sensors. This usually means taking off the fitness tracker before going swimming, but Garmin is now offering two heart rate monitor chest bands that will pair with their fitness trackers, Tech Radar reports.

The two chest bands will offer up to 20 hours of heart rate data. They are designed for triathletes and swimmers. Once the athlete gets out of the water, they can transfer their data to a compatible Garmin fitness tracker.

These chest straps fit closely to the body so that swimmers will not have to worry too much about it slowing them down.

The HRM-Tri is the smaller of the two straps. It is designed for triathletes because of its small and lightweight profile. Since triathlons also involve running and biking, this chest strap measures more than just swimming statistics. It also measures running dynamics, cadence, vertical oscillation and ground contact time along with monitoring swimming.

The HRM-Swim is designed for just swimming. It is a bigger device and includes a longer-lasting battery. The replaceable battery on the HRM-Swim will last 18 months, compared to the 10 month battery life in the HRM-Tri. According to the Garmin blog, the HRM-Swim will stay in place during push-offs and will not cause too much drag in the water.

Both the HRM-Tri and HRM-Swim connect to the Garmin Connect system in order to upload statistics.

To enjoy all of the compatibility with both of these straps, users will need to have either a Forerunner 920XT, fenix 3 or epix fitness tracker from Garmin.

The chest straps are not currently available, but are expected to come out sometime before September. The HRM-Tri will cost $129.99 and the HRM-Swim will cost $99.99. By purchasing both straps for $199.99, buyers will save a little bit of money.