Garmin HRM-RUN (2nd generation)
This is the newer version of the Garmin HRM-run. It's 100% waterproof and can be used in the water however it won't track heart rate when submerged. It's made from improved material to help with chaffing. Wear this chest strap to get the following six measurements of intelligence to help improve your running technique: stride length, cadence, ground contact time and balance, vertical oscillation and vertical ratio.