This rugged, reliable outdoor GPS watch is built to the U.S. military standard 810G for thermal, shock and water resistance (rated to 100 meters). The built in GPS helps track activities and locations in more challenging environments.  The fiber-reinforced polymer case adds strength and durability, and the chemically-strengthened, scratch-resistant display is high-contrast enough to read in bright sunlight, so you can take it with you into the extremes you face every day. Monitor your heart rate, activity, and stress level; train with preloaded activity profiles.  Plus, the fully vented silicone bands include two independent, removable keeper loops to ensure a secure fit and to keep you from getting caught on things.