Apple Watch Ultra 4 Trail Loop

MULTI-DAY BATTERY LIFE—Ultra 4 is a smartwatch with ultramarathon battery stamina, perfect for runners to go the distance—with up to 45 hours of Max Extended Workout tracking. And you can fast-charge in just 15 minutes for up to 18 hours of use.
STAY CLOSER TO YOUR HEART HEALTH—The most accurate heart rate sensing in a wearable, Ultra 4 now measures HRV as often as every five minutes for insights on stress and recovery, and background heart rate readings every five seconds.
A FULL-FEATURED HEALTH TRACKER—Better understand your body with advanced health insights. View your overnight health metrics with the Vitals app and get a daily sleep score, track your menstrual cycle, and take readings of your blood oxygen.
CHECK YOUR READINESS FOR THE DAY—Know when to rest or put yourself to the test. The readiness experience gives you one clear score and can help you determine your capacity to take on the day by analyzing your recent activity, vitals, and sleep.
ULTIMATE RUNNING AND WORKOUT COMPANION—A superior fitness tracker for distance running, triathlons, mountain biking, strength training, and more. Ultra 4 has precision dual-frequency GPS, Pacer, Heart Rate Zones, Custom Workouts, training load, and more.
KEEP HELP CLOSE AT HAND—A smartwatch that puts your safety first. Ultra 4 can detect a hard fall or severe car crash.
RUGGED AND READY TO GO—Ultra 4 is built for extreme environments with a tough titanium case and a strong sapphire crystal display. Water resistant up to 100m, this smartwatch is great for swimmers, divers, and fans of high-speed water sports.
THE FREEDOM OF CELLULAR—With just your smartwatch, you can take and make calls, stream music and podcasts, and listen with your AirPods—even without your iPhone.