14 Products Every Marathoner Should Own, According to Pro Runner Emily Sisson

Garmin Forerunner 265s ($350)

If you've ever run a race in a big city, you know that tall buildings can mess with your watch's accuracy. But it's exactly in those big-race moments that runners want accurate mile splits. That's why Sisson loves her Garmin, which has multi-band GPS (meaning it's significantly more accurate than systems with just one GPS frequency, and is better at navigating buildings and trees that can block the signal). She wears the "s" model because it's made for smaller wrists, and loves that it comes with the Garmin Connect app, where she can monitor stats like heart rate, elevation gain, and more.