Device summary

Garmin

Instinct E 45mm

Polar

Street X

Full specifications

Full specifications
Basic information
Release year20252026
Starting price$250
Display size1.2-inch1.3-inch
Dimensions45.0 mm × 45.0 mm × 14.2 mm45.0 mm × 45.0 mm × 13.8 mm
Weight48 g28 g
Front materialCorning Gorilla Glass 3
Back materialBio-based plastic
Display
Display technologyMIPAMOLED
Resolution176 × 176416 × 416
ProtectionCorning Gorilla Glass 3 (AF + DLC coating)
Performance
Expandable storageNo
Battery & charging
Charging standardGarmin proprietary clip / USB chargingProprietary / USB-C. Smartwatch mode up to 10 days; performance training (GPS + HR) up to 43 h; eco training up to 170 h (power-save — not everyday life). Complete watch 48 g with wristband; body 28 g without. On-device storage 32 MB
Battery typeLithium-ionLi-Pol (385 mAh)
Connectivity
CellularGPS / multi-GNSSGPS / Galileo / BeiDou / QZSS (single-frequency; no dual-frequency GNSS), Route guidance; compass; barometer, Precision Prime™ OHR GEN 3.5; skin temp GEN 1 (no ECG / SpO2 / Elixir suite), Integrated LED flashlight (white / red), Polar Flow
BluetoothBluetoothBluetooth® LE
NFCYes
Build & durability
FrameFiber-reinforced polymerBio-based plastic (PA11+8GF); aluminum; stainless steel
Ingress protection10 ATMWR50 (50 m); MIL-STD-810H

Key differences

The most meaningful measured gaps in size and weight — not an overall winner.

  • Weight

    Street X

    20 g lighter

  • Thickness

    Street X

    0.4 mm thinner · minor difference

  • Height

    Very similar height

  • Width

    Very similar width

Instinct E 45mm vs Street X Size Comparison