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| Forerunner 255 | Forerunner 255s | |
|---|---|---|
General |
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| Lens Material | Corning® Gorilla® Glass 3 | Corning® Gorilla® Glass 3 |
| Bezel Material | fiber-reinforced polymer | fiber-reinforced polymer |
| Quick Release bands | yes (22 mm, Industry standard) | yes (18 mm, Industry standard) |
| Strap material | silicone | silicone |
| Physical size | 45.6 x 45.6 x 12.9 (mm)
Fits wrists with a circumference of 130-205 mm |
41 x 41 x 12.4 (mm)
Fits wrists with a circumference of 110-175 mm |
| Color display | ✔ | ✔ |
| Display Size | 1.3″ (33 mm) diameter | 1.1″ (27.5mm) Diameter |
| Display Resolution | 260 x 260 pixels | 218 x 218 pixels |
| Display Type | sunlight-visible, transflective memory-in-pixel (MIP) | sunlight-visible, transflective memory-in-pixel (MIP) |
| Weight | 49 g | 39 g |
| Battery life | Smartwatch mode: Up to 14 days GPS-Only GNSS mode: Up to 30 hours All-Systems GNSS mode: Up to 25 hours All-Systems GNSS mode plus Multi-Band: Up to 16 hours See Details |
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 |
| Water rating | 5 ATM | 5 ATM |
| Memory/History | 4 GB | 4 GB |
Clock Features |
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| Time/date | ✔ | ✔ |
| GPS Time Sync | ✔ | ✔ |
| Automatic daylight saving time | ✔ | ✔ |
| Alarm clock | ✔ | ✔ |
| Timer | ✔ | ✔ |
| Stopwatch | ✔ | ✔ |
| Sunrise/sunset times | ✔ | ✔ |
Health Monitoring |
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| Wrist-based Heart Rate (constant, every second) | ✔ | ✔ |
| Daily Resting Heart Rate | ✔ | ✔ |
| Abnormal Heart Rate Alerts | yes (high and low) | yes (high and low) |
| Respiration rate (24×7) | ✔ | ✔ |
| Pulse Ox Blood Oxygen Saturation | yes (spot-check, and optional all-day acclimation and in sleep) | yes (spot-check, and optional all-day acclimation and in sleep) |
| Fitness Age | ✔ | ✔ |
| Body Battery™ Energy Monitor | ✔ | ✔ |
| All-day Stress | ✔ | ✔ |
| Relaxation breathing timer | ✔ | ✔ |
| Sleep | yes (advanced) | yes (advanced) |
| Sleep score and insights | ✔ | ✔ |
| Hydration | yes (in Garmin Connect™ and optional Connect IQ™ widget) | yes (in Garmin Connect™ and optional Connect IQ™ widget) |
| Women’s Health | yes (in Garmin Connect™ and optional Connect IQ™ widget) | yes (in Garmin Connect™ and optional Connect IQ™ widget) |
| Health snapshot | ✔ | ✔ |
Sensors |
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| GPS | ✔ | ✔ |
| GLONASS | ✔ | ✔ |
| Galileo | ✔ | ✔ |
| Multi-frequency Positioning | ✔ | ✔ |
| Garmin Elevate™ wrist heart rate monitor | ✔ | ✔ |
| Barometric altimeter | ✔ | ✔ |
| Compass | ✔ | ✔ |
| Gyroscope | ✔ | ✔ |
| Accelerometer | ✔ | ✔ |
| Thermometer | ✔ | ✔ |
| Pulse Ox Blood Oxygen Saturation Monitor | ✔ | ✔ |
Daily Smart Features |
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| Connectivity | Bluetooth®, ANT+® | Bluetooth®, ANT+® |
| Connect IQ™ (downloadable watch faces, data fields, widgets and apps) | ✔ | ✔ |
| On-device Connect IQ™ Store | ✔ | ✔ |
| Smart Notifications | ✔ | ✔ |
| Text response/reject phone call with text (Android™ only) | ✔ | ✔ |
| Calendar | ✔ | ✔ |
| Weather | ✔ | ✔ |
| Realtime settings sync with Garmin Connect™ mobile | ✔ | ✔ |
| Battery saver (customizable low power watch) | ✔ | ✔ |
| Controls smartphone music | ✔ | ✔ |
| Find My Phone | ✔ | ✔ |
| Find My Watch | ✔ | ✔ |
| VIRB® Remote | ✔ | ✔ |
| Smartphone compatibility | iPhone® and Android™ | iPhone® and Android™ |
| Pairs with Garmin Connect™ Mobile | ✔ | ✔ |
| Garmin Pay™ | ✔ | ✔ |
Safety and Tracking Features |
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| LiveTrack | ✔ | ✔ |
| Live Event Sharing | Android™ Only | Android™ Only |
| Incident Detection during select activities | ✔ | ✔ |
| Assistance | ✔ | ✔ |
Activity Tracking Features |
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| Step counter | ✔ | ✔ |
| Move bar (displays on device after a period of inactivity; walk for a couple of minutes to reset it) | ✔ | ✔ |
| Auto goal (learns your activity level and assigns a daily step goal) | ✔ | ✔ |
| Calories burned | ✔ | ✔ |
| Floors climbed | ✔ | ✔ |
| Distance traveled | ✔ | ✔ |
| Intensity minutes | ✔ | ✔ |
| TrueUp™ | ✔ | ✔ |
| Move IQ™ | ✔ | ✔ |
| Garmin Connect™ Challenges app | yes (optional Connect IQ app) | yes (optional Connect IQ app) |
Gym & Fitness Equipment |
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| Available gym activity profiles | Strength, HIIT, Cardio and Elliptical Training, Stair Stepping, Floor Climbing, Indoor Rowing, Pilates, Yoga | Strength, HIIT, Cardio and Elliptical Training, Stair Stepping, Floor Climbing, Indoor Rowing, Pilates, Yoga |
| Cardio workouts | ✔ | ✔ |
| Strength workouts | ✔ | ✔ |
| HIIT workouts | ✔ | ✔ |
| Yoga workouts | ✔ | ✔ |
| Pilates workouts | ✔ | ✔ |
| On-screen workout animations | ✔ | ✔ |
| On-screen workout muscle maps | ✔ | ✔ |
| Automatic rep counting | ✔ | ✔ |
Training, Planning and Analysis Features |
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| HR zones | ✔ | ✔ |
| HR alerts | ✔ | ✔ |
| HR calories | ✔ | ✔ |
| % HR max | ✔ | ✔ |
| % HRR | ✔ | ✔ |
| Recovery time | ✔ | ✔ |
| Auto max HR | ✔ | ✔ |
| Morning report | ✔ | ✔ |
| Race glance/widget | ✔ | ✔ |
| HRV status | ✔ | ✔ |
| HR Broadcast (broadcasts HR data over ANT+™ to paired devices) | ✔ | ✔ |
| Respiration rate (during exercise) | yes (with compatible accessory) | yes (with compatible accessory) |
| GPS speed and distance | ✔ | ✔ |
| Customizable data pages | ✔ | ✔ |
| Customizable activity profiles | ✔ | ✔ |
| Auto Pause® | ✔ | ✔ |
| Interval training | ✔ | ✔ |
| Improved interval (includes open repeats, intervals data page, rest screen and auto detection) | ✔ | ✔ |
| Advanced workouts | ✔ | ✔ |
| Downloadable training plans | ✔ | ✔ |
| Auto Lap® | ✔ | ✔ |
| Manual lap | ✔ | ✔ |
| Rest timer | ✔ | ✔ |
| Configurable lap alerts | ✔ | ✔ |
| VO2 Max (Run) | ✔ | ✔ |
| VO2 Max (Trail Run) | ✔ | ✔ |
| Training Status | improved | improved |
| Training Load | ✔ | ✔ |
| Training load focus | ✔ | ✔ |
| Training Effect | ✔ | ✔ |
| Training Effect (anaerobic) | ✔ | ✔ |
| Primary benefit (Training Effect labels) | ✔ | ✔ |
| Improved recovery time | ✔ | ✔ |
| Daily suggested workouts | yes (7 days) | yes (7 days) |
| Custom alerts | ✔ | ✔ |
| Audio prompts | ✔ | ✔ |
| Finish time | ✔ | ✔ |
| Virtual Partner | ✔ | ✔ |
| Race an Activity | ✔ | ✔ |
| Auto multisport activities | ✔ | ✔ |
| Manual multisport activities | ✔ | ✔ |
| Course guidance | ✔ | ✔ |
| Touch and/or button lock | ✔ | ✔ |
| Auto scroll | ✔ | ✔ |
| Activity history on watch | ✔ | ✔ |
| Physio TrueUp | ✔ | ✔ |
Running Features |
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| Available run profiles | Running, Outdoor Track Running, Treadmill Running, Indoor Track Running, Trail Running, Virtual Running, Ultra Running | Running, Outdoor Track Running, Treadmill Running, Indoor Track Running, Trail Running, Virtual Running, Ultra Running |
| GPS-based distance, time and pace | ✔ | ✔ |
| Running dynamics | yes (with compatible accessory) | yes (with compatible accessory) |
| Vertical oscillation and ratio | yes (with compatible accessory) | yes (with compatible accessory) |
| Ground contact time and balance | yes (with compatible accessory) | yes (with compatible accessory) |
| Stride length (real time) | yes (with compatible accessory) | yes (with compatible accessory) |
| Cadence (provides real-time number of steps per minute) | ✔ | ✔ |
| Running power | yes (with compatible accessory) | yes (with compatible accessory) |
| Performance condition | ✔ | ✔ |
| Lactate threshold | yes (with compatible accessory) | yes (with compatible accessory) |
| PacePro™ Pacing Strategies | ✔ | ✔ |
| Run workouts | ✔ | ✔ |
| Race predictor | ✔ | ✔ |
| Course- and weather-specific race predictor | ✔ | ✔ |
| Foot pod capable | ✔ | ✔ |
Outdoor Recreation |
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| Available outdoor recreation profiles | Hiking, Skiing, Snowboarding, XC Classic Skiing, Stand Up Paddleboarding, Rowing | Hiking, Skiing, Snowboarding, XC Classic Skiing, Stand Up Paddleboarding, Rowing |
| Point-to-point navigation | ✔ | ✔ |
| Bread crumb trail in real time | ✔ | ✔ |
| Back to start | ✔ | ✔ |
| TracBack® | ✔ | ✔ |
| UltraTrac mode | ✔ | ✔ |
| Up Ahead | ✔ | ✔ |
| Elevation profile | ✔ | ✔ |
| Distance to destination | ✔ | ✔ |
| Barometric trend indicator with Storm Alert | ✔ | ✔ |
| Trail run auto climb | ✔ | ✔ |
| Vertical speed | ✔ | ✔ |
| Total ascent/descent | ✔ | ✔ |
| Future elevation plot | ✔ | ✔ |
| Projected waypoint | ✔ | ✔ |
| Sun and moon information | ✔ | ✔ |
Cycling Features |
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| Available cycling profiles | Biking, Indoor Biking, Mountain Biking, eBiking, eMountain Biking | Biking, Indoor Biking, Mountain Biking, eBiking, eMountain Biking |
| Alerts (triggers alarm when you reach goals including time, distance, heart rate or calories) | ✔ | ✔ |
| Courses | ✔ | ✔ |
| Bike lap and lap maximum power (with power sensor) | ✔ | ✔ |
| Race an activity | ✔ | ✔ |
| FTP (Functional Threshold Power) | yes (with compatible accessory) | yes (with compatible accessory) |
| Compatible with Vector™ and Rally™ (power meters) | ✔ | ✔ |
| Power meter compatible | ✔ | ✔ |
| Compatible with Varia Vision™ (head-mounted display) | ✔ | ✔ |
| Compatible with Varia™ radar (rear-facing radar) | ✔ | ✔ |
| Compatible with Varia™ lights | ✔ | ✔ |
| Speed and cadence sensor support (w/sensor) | ✔ | ✔ |
Swimming Features |
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| Available swim profiles | Pool Swimming, Open Water Swimming | Pool Swimming, Open Water Swimming |
| Open-water swim metrics (distance, pace, stroke count/rate, stroke distance, swim efficiency (SWOLF), calories) | ✔ | ✔ |
| Pool swim metrics (lengths, distance, pace, stroke count, swim efficiency (SWOLF), calories) | ✔ | ✔ |
| Stroke type detection (freestyle, backstroke, breaststroke, butterfly) (pool swim only) | ✔ | ✔ |
| Drill logging (pool swim only) | ✔ | ✔ |
| Basic rest timer (up from 0) (pool swim only) | ✔ | ✔ |
| “Repeat on” rest timer (pool swim only) | ✔ | ✔ |
| Auto rest (pool swim only) | ✔ | ✔ |
| Time and distance alerts | ✔ | ✔ |
| Pacing alerts (pool swim only) | ✔ | ✔ |
| Countdown start (pool swim only) | ✔ | ✔ |
| Pool swim workouts | ✔ | ✔ |
| Critical swim speed | ✔ | ✔ |
| Underwater wrist-based heart rate | ✔ | ✔ |
| Heart rate from external HRM (real-time during rests, interval and session stats during rests, and automatic heart rate download post-swim) | yes (with HRM-Swim™ or HRM-Pro™) | yes (with HRM-Swim™ or HRM-Pro™) |
Kid Activity Tracking Features |
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| Toe-to-Toe™ Challenges app | yes (optional Connect IQ Toe-to-Toe™ Challenges app) | yes (optional Connect IQ Toe-to-Toe™ Challenges app) |
Connectivity |
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| Smart trainer control | ✔ | ✔ |
In the Box:
- Forerunner 255 or 255s in selected color
- Charge/data cable
- Documentation