| Sizes | 46 mm Forerunner 265 and 42 mm Forerunner 265S | — |
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| Display | 1.3-inch AMOLED touchscreen (416x416) with optional always-on mode, plus five physical buttons (Forerunner 265, 46 mm) | 1.28-inch AMOLED touchscreen, 416 x 416, Gorilla Glass 3, always-on option with ambient light sensor |
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| Case | 46.1 x 46.1 x 12.9 mm (Forerunner 265) | — |
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| Battery | Up to 13 days in smartwatch mode (up to 15 days for the 265S); up to 20 hours in GPS mode (24 hours for the 265S) (Garmin claims) | Up to 7 days in smartwatch mode; up to 30 hours in training mode (Polar's spec table lists 27 hours performance, 90 hours eco and 8 days smartwatch); 310 mAh replaceable Li-Pol battery |
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| Navigation | Multi-band GPS with SatIQ technology; PacePro pacing guidance | Preinstalled and upgradeable offline topographic maps, planned routes, breadcrumbs, komoot turn-by-turn guidance |
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| Storage | Up to 8GB for music and data; Spotify, Deezer and Amazon Music downloads (subscription required) | 32 GB (offline maps), 37 MB memory, 275 MHz CPU |
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| Training | Training readiness, morning report, daily suggested workouts, Garmin Coach, VO2 max, running power and running dynamics | — |
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| Health | Wrist-based Pulse Ox, Body Battery, sleep score, HRV status, stress tracking, menstrual cycle tracking | — |
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| Features | Garmin Pay, smart notifications, incident detection and LiveTrack | — |
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| Durability | 5 ATM water rating | — |
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| OS | Garmin firmware; pairs with Android and iOS through the Garmin Connect app | — |
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| Body | — | 44.7 x 44.7 x 12.2 mm; 53 g with wristband (35 g without); glass-fibre reinforced plastic case with stainless steel bezel; 22 mm quick-release silicone wristband; WR50 water resistance |
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| Sensors | — | Polar Elixir biosensing: 4th-generation optical heart rate, wrist-based ECG, SpO2, nightly skin temperature; barometer, magnetometer compass, accelerometer, gyroscope |
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| GPS | — | Dual-frequency GPS (L1/L5) with GLONASS, Galileo, BeiDou and QZSS |
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| Connectivity | — | Bluetooth LE (no ANT+), USB-C charging cable (proprietary connector) |
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| Software | — | PolarOS; Polar Flow app; Training Load Pro, Nightly Recharge, Smart Coaching; over 150 sport profiles |
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| Colors | — | Night Black, Greige Sand |
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