Polar S3 Stride Sensor

Polar S3 Stride Sensor comes in black with a new, firm shoe attachment which guarantees accurate sp

Polar 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 analyse the effectiveness and efficiency of your run. The S3 Stride Sensor measures running speed/pace and distance and helps improve running technique by telling your running cadence and stride length. Determines your Running Index, which tells you about your running performance. The S3 is

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