Garmin Forerunner 255S

In the Box

• Forerunner 255S
• Charge/data cable
• Documentation

Physical & Performance

Display Size	1.1″ (27.5mm) Diameter
Display Type	sunlight-visible, transflective memory-in-pixel (MIP)
Battery life	Smartwatch mode: Up to 12 days GPS-only GNSS mode: Up to 26 hours All-Systems GNSS mode: Up to 20 hours All-Systems GNSS mode plus Multi-Band: Up to 13 hours See Details
Display resolution	218 x 218 pixels
GPS	Yes
Weight	39 g

Maps & Navigation

Memory/History

4 GB

READY FOR THE LONG RUN

Get an uninterrupted picture of your daily health and nightly sleep with up to 14 days of battery life in smartwatch mode and up to 30 hours in GPS mode.

(ALMOST) AS LIGHT AS A FEATHER

With its sleek design and 1.7 oz weight, youll almost forget youre wearing Forerunner 255 even when youre asleep.

SWEAT-READY MATERIALS

Featuring easy-to-use buttons and a silicone band, this watch is ready to wear and tear with durable CorningGorillaGlass 3.

MORNING REPORT

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

HRV STATUS

Gain a deeper understanding of your overall health, recovery and training performance throughheart rate variabilitywhile you sleep, based on technology developed by our Firstbeat Analyticsteam.

BUILT-IN SPORTS APPS

Tap into 30+ built-in activities, including the triathlon and open-water swimming profiles new to the Forerunner 255 series. 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 Connectsmartphone app calendar.

GARMIN COACH

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

RUNNING POWER

When using aRunning Dynamics PodorHRM-Promonitor, get a continuous measurement on your wrist of how much power youre applying to the road as you run, so you can manage your effort.

RECOVERY TIME

Knowhow long to recoverbefore your next high-effort workout based on your latest training as well as overall stress, sleep and daily activities outside of workouts.

PACEPROFEATURE

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 whats ahead.

TRAINING STATUS

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

ACUTE LOAD

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

TRAINING EFFECT

See how your workouts influence your endurance, speed and power with aerobic and anaerobictraining effectfeedback.

PERFORMANCE CONDITION

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

RUNNING DYNAMICS

When using aRunning Dynamics PodorHRM-Pro monitor, the Forerunner 255 watch measures crucialrunning metricssuch as cadence, stride length, ground contact time and balance, and more while comparing to others in the Garmin Connect app.

COURSES

Create or find existing courses in theGarmin Connect app, so youll 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.

VISUAL RACE PREDICTOR

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 trainings impact over time.

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 yourheart rate2with our latest-generation heart rate sensor and will alert you if it stays too high or too low while youre at rest. It also helps gauge how hard you work during activities even while swimming.

BODY BATTERYENERGY MONITORING

Track your bodys energy levels so you can find the best times for activity and rest2.

IMPROVED SLEEP MONITORING AND SLEEP SCORE

Understand how your body is recovering and get ready for training with our improved sleep monitoring feature. After waking up, youll receive a sleep score, as well as breakdown of your sleep stages, Pulse Ox3and respiration, alongside detailed insights for improvedsleep quality.

WOMENS HEALTH TRACKING

Use the Garmin Connect app to track yourmenstrual cycleorpregnancy.Log symptoms, get exercise and nutrition education, and more. Even see and log details on your wrist with the Womens Health Tracking app.

INTENSITY MINUTES

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

STRESS TRACKING

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

HEALTH SNAPSHOTFEATURE

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 theGarmin Connect appon your compatible smartphone.

MULTI-BAND GNSS SUPPORT

Access multiple global navigation satellite systems, and get access to multiple frequencies sent by navigation satellites for improved accuracy in areas where GNSS signals are reflected, weak or typically don’t penetrate giving you superior accuracy for how far and how fast youve run even in challenging environments.

GARMIN PAY CONTACTLESS PAYMENTS

Breeze through checkout lines with Garmin Pay contactless payments1throughparticipating providers.

SMART NOTIFICATIONS

Receive emails, texts and alerts right on your watch when paired with yourAppleor Androidsmartphone. You can even respond to texts if you have an Android phone.

SAFETY AND TRACKING FEATURES

If you feel unsafe or if your watch senses that an incident occurred, the Assistance and incident detection features4send 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 location4and even view your entire preplanned course. Rest assured that your loved ones know exactly where youre running.

GARMIN CONNECT APP

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.

CONNECT IQSTORE

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