The Garmin Enduro 3 is Garmin's ultra-endurance flagship, built specifically for expedition, ultramarathon and thru-hiking use where recharging opportunities are rare — it sits above the epix Pro and Fenix lines specifically on battery life. It has a single 51mm case size with a titanium bezel, fibre-reinforced polymer case, and scratch-resistant sapphire lens, and integrates solar charging beneath the display itself rather than as a visible ring, on a 1.4" monochrome MIP transflective screen that stays legible in direct sunlight. It carries the same broad training and outdoor toolkit as Garmin's other premium GPS watches: wrist heart rate, Pulse Ox, HRV status, sleep coaching, multi-band GPS with SatIQ auto-selection, round-trip routing, and a built-in flashlight, in this Carbon Gray DLC Titanium finish with a black UltraFit sport loop band. It is rated 10 ATM water resistant and weighs about 63g. Its headline feature is battery life: up to 36 days in smartwatch mode without solar (up to 90 days with solar charging), up to 120 hours in multi-band GPS mode with SatIQ, up to 320 hours in max-battery GPS mode with solar, and up to 77 days in expedition GPS mode with sufficient solar exposure — multiples of what any Forerunner or epix Pro model in this range offers.