Ready for the long run
Get an uninterrupted picture of your daily health and nightly sleep with many days of battery life in smartwatch mode and ulong hours in GPS mode.

(Almost) as light as a feather
With its sleek design and light weight, you'll almost forget you're wearing Forerunner 255S - even when you're asleep.

Sweat-ready materials
Featuring easy-to-use buttons and a silicone band, this watch is ready to wear - and tear - with durable Corning Gorilla Glass 3.

HRV status
Gain a deeper understanding of your overall health, recovery and training performance through heart rate variability while you sleep, based on technology developed by the Firstbeat Analytics team.

Built-in sports apps
Tap into 30+ built-in activities, including the triathlon and open-water swimming profiles. For races and brick workouts, transition to the next activity with a single button press.

Race widget
Get ready for your next race with training tips, personalized daily suggested workouts and completion time predictions based on course details, weather and performance.

Daily suggested workouts
View your entire week of daily suggested workouts, which adapt after every run to match your performance and recovery as well as the races coming up in your Garmin Connect smartphone app calendar.

Triathlon and multisport profiles
Switch between sports with one press by using built-in profiles for triathlons, duathlons, brick workouts and swimruns. Or, create your own custom multisport profiles.

Running power
When using a Running Dynamics Pod or HRM-Pro monitor, get a continuous measurement on your wrist of how much power you're applying to the road as you run, so you can manage your effort.

Recovery time
Know how long to recover before your next high-effort workout based on your latest training as well as overall stress, sleep and daily activities outside of workouts.

PacePro feature
To help you plan your race day strategy, this feature offers GPS-based pace guidance for a selected course or distance, so you can tailor your efforts to what's ahead.

Cross-training
Mix up your training with different types of workouts. Free HIIT, strength, cardio, yoga and Pilates workouts come preloaded on the watch, and you can download more from the Garmin Connect app.

Wrist-based heart rate
The watch constantly samples your heart rate with the heart rate sensor and will alert you if it stays too high or too low while you're at rest. It also helps gauge how hard you work during activities - even while swimming.

Improved sleep monitoring and sleep score
Understand how your body is recovering - and get ready for training - with the improved sleep monitoring feature. After waking up, you'll receive a sleep score, as well as breakdown of your sleep stages, Pulse Ox and respiration, alongside detailed insights for improved sleep quality.

SatIQ technology
Multi-band GNSS with SatIQ technology ensures an excellent positioning accuracy in any environment while also optimizing the device's battery life.

Smart notifications
Receive emails, texts and alerts right on your watch when paired with your smartphone.

Safety and tracking features
If you feel unsafe or if your watch senses that an incident occurred, the Assistance and incident detection features send your location to emergency contacts. Incident detection is enabled by default for select activity profiles only.

LiveTrack feature
Use LiveTrack to let friends and family follow your real-time location and even view your entire preplanned course. Rest assured that your loved ones know exactly where you're running.