Garmin
Device summary
Polar
Street X
Full specifications
| Basic information | ||
|---|---|---|
| Release year | 2025 | 2026 |
| Starting price | — | $250 |
| Display size | 1.2-inch | 1.3-inch |
| Dimensions | 45.0 mm × 45.0 mm × 14.2 mm | 45.0 mm × 45.0 mm × 13.8 mm |
| Weight | 48 g | 28 g |
| Front material | — | Corning Gorilla Glass 3 |
| Back material | — | Bio-based plastic |
| Display | ||
| Display technology | MIP | AMOLED |
| Resolution | 176 × 176 | 416 × 416 |
| Protection | — | Corning Gorilla Glass 3 (AF + DLC coating) |
| Performance | ||
| Expandable storage | — | No |
| Battery & charging | ||
| Charging standard | Garmin proprietary clip / USB charging | Proprietary / 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 type | Lithium-ion | Li-Pol (385 mAh) |
| Connectivity | ||
| Cellular | GPS / multi-GNSS | GPS / 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 |
| Bluetooth | Bluetooth | Bluetooth® LE |
| NFC | Yes | — |
| Build & durability | ||
| Frame | Fiber-reinforced polymer | Bio-based plastic (PA11+8GF); aluminum; stainless steel |
| Ingress protection | 10 ATM | WR50 (50 m); MIL-STD-810H |
| Basic information | ||
|---|---|---|
| Release year | 2025 | 2026 |
| Starting price | — | $250 |
| Display size | 1.2-inch | 1.3-inch |
| Dimensions | 45.0 mm × 45.0 mm × 14.2 mm | 45.0 mm × 45.0 mm × 13.8 mm |
| Weight | 48 g | 28 g |
| Front material | — | Corning Gorilla Glass 3 |
| Back material | — | Bio-based plastic |
| Display | ||
| Display technology | MIP | AMOLED |
| Resolution | 176 × 176 | 416 × 416 |
| Protection | — | Corning Gorilla Glass 3 (AF + DLC coating) |
| Performance | ||
| Expandable storage | — | No |
| Battery & charging | ||
| Charging standard | Garmin proprietary clip / USB charging | Proprietary / 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 type | Lithium-ion | Li-Pol (385 mAh) |
| Connectivity | ||
| Cellular | GPS / multi-GNSS | GPS / 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 |
| Bluetooth | Bluetooth | Bluetooth® LE |
| NFC | Yes | — |
| Build & durability | ||
| Frame | Fiber-reinforced polymer | Bio-based plastic (PA11+8GF); aluminum; stainless steel |
| Ingress protection | 10 ATM | WR50 (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
What these size differences mean
Calculated from the dimensions shown, rounded to 0.1 mm and 1 g. Percentages use the smaller measurement as the reference. Fold and rotation settings affect the dimensions compared.
- Both have the same listed width (45 mm) at the displayed precision. Check this difference against the width of your current device and pocket opening.
- Both have the same listed height (45 mm) at the displayed precision. This describes the body outline; screen diagonal alone does not tell you the overall size.
- Instinct E 45mm is 0.4 mm (2.9% relative to Street X) thicker. Cases and camera protrusions can change the clearance you need.
- Street X is 20 g lighter. This is the listed device-weight difference, not a measured comfort rating.
Use these figures to compare physical size. They do not establish one-handed reach, pocket fit, durability or an overall winner.
Sources and measurement notes
Sizometry compares published specifications and calculates differences. These are not hands-on measurements or tests of comfort, performance or pocket fit.
Instinct E 45mm
Check the exact model, year, region and configuration on the linked page. References may cover several variants. Folded and unfolded dimensions differ; cases and camera protrusions may change the space a device needs. Drawings share a relative scale and are not calibrated to life size on your screen.