Garmin Forerunner 165 vs Polar Street X

Garmin Forerunner 165

Garmin Forerunner 165

vsPolar Street X

Polar Street X

Garmin Forerunner 165Polar Street X
Display1.2-inch (30.4 mm) AMOLED touchscreen, 390 x 390 pixels, optional always-on mode; five physical buttons; chemically strengthened glass lens1.28-inch AMOLED touchscreen, 416 x 416, always-on option, Gorilla Glass 3
Case43 x 43 x 11.6 mm; 39 g; fiber-reinforced polymer bezel; silicone strap with 20 mm quick release; fits wrists of 126-203 mm—
BatteryUp to 11 days in smartwatch mode; up to 20 days in Battery Saver smartwatch mode; up to 19 hours in GPS-only GNSS mode; up to 17 hours in All-Systems GNSS mode (Garmin figures)Up to 10 days in smartwatch mode; up to 43 hours with GPS in performance training mode (170 hours in eco mode); 385 mAh, replaceable
NavigationGPS, GLONASS and Galileo; barometric altimeter; compass; course guidance—
Health SensorsElevate wrist heart rate monitor, Pulse Ox blood oxygen, accelerometer, thermometer, ambient light sensor; sleep score, Body Battery, HRV status, respiration, all-day stress, fitness age, women's health tracking—
Sports25+ activity profiles including trail running, open water swimming, pickleball and tennis; adaptive training plans, daily suggested workouts, PacePro, running power and running dynamics170+ sports and activities, Training Load Pro, Nightly Recharge, SleepWise, Sleep Plus Stages
ConnectivityBluetooth, ANT+; Connect IQ store; smart notifications; Garmin Pay; compatible with iPhone and AndroidBluetooth LE; proprietary USB-C charging cable
Memory4 GB—
Water Resistance5 ATM—
Body—45 x 45 x 13.8 mm; 48 g with wristband, 28 g without; bio-based plastic case; 22 mm quick-release strap
Positioning—GPS, Galileo, BeiDou, QZSS with assisted GPS; barometer, compass; route guidance and back to start
Sensors—Precision Prime optical heart rate, nightly skin temperature, accelerometer, gyroscope, barometer, magnetometer; no ECG or SpO2
Durability—WR50 water resistance; tested to MIL-STD-810H; -20 to 50 °C operation
Performance—275 MHz CPU, 5 MB memory, 32 MB storage
Extras—Integrated LED flashlight with white and red light; Polar Flow app and web service included
Colors—Night Black, Snow White, Forest Green