Polar FT2 Heart Rate Monitor Wristband Size : 8.5  . NOTE - Measurements taken from the LAST HOLE to the END OF RUBBER next to buckle (not from end to end). Wristband Size : 8.5  . NOTE - Measurements taken from the LAST HOLE to the END OF RUBBER next to buckle (not from end to end). Shows heart rate on large and easy to read display Records average and maximum heart rate Displays a summary of your latest workout Simple one-button start and coded heart rate transmission to avoid cross-talk Helps improve your fitness with automatic age-based heart rate target zone