Two decades ago, when heart-rate monitors were starting to show up on the wrists of serious athletes, Polar was what was worn. Back then, you needed a chest strap, and the functions on the watch were pretty basic, but when compared to the alternative of holding two fingers to your throat, they were pretty impressive. Now there's a crowded field of smartwatches with heart-rate monitors, but Polar is still commanding the respect of serious athletes. The new Vantage V features the most accurate optical heart-rate monitor that the company has produced, and the number of functions in the sleek and comfortable watch is astounding.
