| Sizes | 46 mm Forerunner 265 and 42 mm Forerunner 265S | 40 mm and 44 mm; Bluetooth and LTE variants; Green, Silver and Cream |
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| Display | 1.3-inch AMOLED touchscreen (416x416) with optional always-on mode, plus five physical buttons (Forerunner 265, 46 mm) | Super AMOLED, 480x480 (44 mm) / 432x432 (40 mm), 2,000 nits, sapphire crystal, always-on option |
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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 40 hours (always-on display off), up to 30 hours (always-on display on); 425 mAh (44 mm), 300 mAh (40 mm), fast wireless charging |
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| Navigation | Multi-band GPS with SatIQ technology; PacePro pacing guidance | — |
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| Storage | Up to 8GB for music and data; Spotify, Deezer and Amazon Music downloads (subscription required) | 32GB |
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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 | 5ATM, IP68, MIL-STD-810H |
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| OS | Garmin firmware; pairs with Android and iOS through the Garmin Connect app | Wear OS Powered by Samsung, One UI Watch; works with Android 11 or later (not iPhone) |
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| Chipset | — | Exynos W1000 (5-core, 3 nm), 1.6GHz |
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| RAM | — | 2GB |
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| Body | — | Armor Aluminum; 44.4 x 44.4 x 9.7 mm, 33.8 g (44 mm); 40.4 x 40.4 x 9.7 mm, 28.9 g (40 mm) |
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| Sensors | — | BioActive Sensor (optical heart rate, ECG, bioelectrical impedance), infrared skin temperature, accelerometer, barometer, gyro, geomagnetic, light |
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| Connectivity | — | Bluetooth 5.3, Wi-Fi 2.4GHz + 5GHz, NFC, dual-frequency L1+L5 GPS, optional LTE |
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