Polar 91039283

S3+ STRIDE SENSOR S3+ stride sensor comes in black with a new, firm shoe attachment which guarantees accurate speed and distance measurement. This small and lightweight sensor measures each stride you take, helping you analyze the effectiveness and efficiency of your run.

- Measures running speed/pace and distance
- Helps improve running technique by telling your running cadence and stride length
- Determines your Running Index, which tells you about your running performance
- Shock and water resistant, handling even the most demanding runs