Garmin Forerunner 255 Slate Grey

Receive an overview of your sleep, recovery and training outlook as soon as you wake up — alongside HRV status and weather. You can even customise your report to show you what you want to see.

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

Tap into 30+ built-in activities, including the triathlon and open-water swimming profiles — new to the Forerunner 255 running watch series. For races and brick workouts, transition to the next activity with a single button press.

Get ready for your next race, including marathons, with training tips, personalised daily suggested workouts and completion time predictions. Just enter your race and we’ll build a plan that’ll help you meet your goals.

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.

Free adaptive training plans include 5K, 10K and half-marathon programmes, featuring guidance from expert coaches that adapt to you and your goals.

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.

This smartwatch measures crucial running metrics such as cadence, stride length, ground contact time and more.

See how much power you’re applying to the trail or the road so you can manage your effort and fine-tune your training. No accessory required.

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.

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.

Don’t run out of steam before the activity is over. After configuring your data fields in the running activity, understand how to adjust your pace over varying terrain to perform according to your plan.

Using new indicators such as HRV status, your recent exercise history and performance, get an easy insight into your overall effort — and whether you're training productively, peaking or strained.

See your training history, and compare the intensity of your recent workouts to the optimal range to help improve your fitness.

See how your workouts influence your endurance, speed and power with aerobic and anaerobic training effect feedback.

While you run, get an analysis of your pace and heart rate for a real-time assessment of your current ability to perform.

Create or find existing courses in the Garmin Connect app, so you'll never run out of places to run. Or plan one on other platforms such as Strava and Komoot, then automatically sync them to your Forerunner.

Ready for some speedwork? Input your lane on the built-in track run activity to record accurate lap distances and see your distances in metres.

Based on your running history and overall fitness level, get an estimate of what your pace could be for a 5K, 10K — or even a marathon. Plus, trend data highlights your training's impact over time.

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.

View your entire week of daily suggested cycling workouts directly on your smartwatch — which adapt to match your performance and the demands of upcoming events in your Garmin Connect™ smartphone app calendar.

The watch constantly samples your heart rate² with our latest-generation 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.

Understand how your body is recovering - and get ready for training - with our improved sleep monitoring feature. After waking up, you'll receive a sleep score, as well as a breakdown of your sleep stages, Pulse Ox³ and respiration, alongside detailed insights for improved sleep quality.

This wrist-based pulse ox sensor³ monitors blood oxygen saturation levels to support advanced sleep monitoring and altitude acclimation.

Use the Garmin Connect app to track your menstrual cycle or pregnancy. Log symptoms, get exercise and nutrition education, and more. Even see and log details on your wrist with the Women's Health Tracking app.

Our intensity minutes feature tells you when during the day you earned them and during what activity.

Find out if you're having a calm, balanced or stressful day. Relax reminders will even prompt you to do a short breathing activity when the watch detects that you're feeling stressed.

Log a 2-minute session to record key stats, including heart rate2, heart rate variability, Pulse Ox³, respiration and stress. Then generate a report with those stats to share via the Garmin Connect app on your compatible smartphone.

See your energy levels throughout the day so you’ll know when your body is charged up and ready for activity or drained and needing to recharge with restful sleep. And get even more details and personal insights on how sleep, naps, daily activities and high stress specifically impact your energy².

Automatically track or log your naps to see how they benefit your body and to check the recommended time and duration they should be.

Multi-band GNSS with SatIQ technology ensures the best positioning accuracy in any environment while also optimising the device’s battery life.

Breeze through checkout lines with Garmin Pay contactless payments¹ through participating providers.

Receive emails, texts and alerts right on your watch when paired with your Apple® or Android™ smartphone. You can even respond to texts if you have an Android phone.

If you feel unsafe or if your watch senses that an incident occurred, the Assistance and incident detection features⁴ send your location to emergency contacts. Incident detection is enabled by default for select activity profiles only.

Use LiveTrack to let friends and family follow your real-time location⁴ and even view your entire pre-planned course. Rest assured that your loved ones know exactly where you're running.

See your health and fitness information, connect and compete with friends, sign up for challenges to earn badges and more — all in one free, zero-subscription app.

Download custom watch faces, add data fields, and get apps and widgets from the Connect IQ Store app downloaded on your compatible smartphone.