Using your heart rate sensor in water
Polar H10 heart rate sensor is water resistant. The GymLink technology can be used in water activities, but Bluetooth® wireless technology will not work in water. You can still record your heart rate from your swim and transfer the data afterwards to Polar Beat, the mobile app. Please notice that sea and pool water are very conductive, and electrodes may short-circuit, preventing electrically measured signals from being detected by the heart rate sensor.
When using a bathing suit, the best performance is achieved by wearing the heart rate sensor underneath it.