Garmin Forerunner 735XT
The draw: Super-slim style
The Garmin FR735XT is Garmin’s smallest triathlon watch to date, making it a viable contender to become your everyday watch. It contains an optical heart rate sensor, though it lacks a barometric altimeter (less ideal on training days in the mountains). Still, if you’re looking for a small triathlon watch that gets about 10–12 hours of real-world GPS-on time per charge, this is the clear winner.