Need a Heart Rate Monitor for swimming? The Polar FT1 with the T31 Transmitter is our recommendation in the Polar line because the T31 transmitter is a sealed unit that works best with water conductivity to give strong signals while swimming. 

In the Garmin line, the Garmin Swim Transmitter will record your data and store it in the transmitter and when paired to the compatible watch, will display our workout data.