Apple Watch Ultra GPS + Cellular, 49 mm, Titanium Case Alpine Loop Starlight - Medium (fits 145-190 mm wrists) For adventurers and athletes all over the world - the most rugged, powerful Apple Watch ever. The Apple Watch Ultra comes with new 49 mm, titanium case in aerospace grade. It provides the perfect balance of weight, durability, and corrosion resistance A customisable Action button offers instant access to a wide range of useful features. The smartwatch has the best battery life of any Apple Watch, reaching up to 36 hours during normal use. Additionally, a new low-power setting, ideal for multi-day experiences, can extend battery life to reach up to 60 hours. The Wayfinder watch face is designed specifically for the larger Apple Watch Ultra display and includes a compass built into the dial, with space for up to eight complications. Our tip: Other straps are available. Trail Loop, Alpine Loop and Ocean Band - all featuring unique designs to sit comfortably and securely throughout all your adventures.