The Garmin Fenix 7X is the biggest watch in the Fenix 7 range, offering the longest battery life, solar charging and the biggest screen. It also offers a wide variety of sensors that allow for tracking your activities more accurately than previous models. The design of this model has been updated to be sleeker with less protruding buttons on its face which makes it easier to use when wearing gloves or other items like wristbands over top of it. This particular model even includes an altimeter so you can track how high up you are as well as barometer readings for measuring air pressure changes due to weather conditions. It's easy enough on its own but if you want some extra features then there are lots available through Connect IQ apps including Strava Live Segments where data from your run will automatically upload directly into Strava without needing any additional steps taken by yourself afterwards!