Polar-Wear Link-Nike-Set-M-XXL-92043571-Heart-Rate-Monitor-Polar-92043571-The-Polar-Nike-heart-rate-sensor-captures-your-heart-rate-&-sends-the-data-with-ECG-accuracy-to-the-Nike-system-as-well-as-to-almost-any-Polar-training-computer-The-comfortable-elastic-strap-is-designed-to-fit-perfectly-to-the-shape-of-your-body-to-allow-you-full-freedom-of-movement-while-training-With-side-fastenings-the-electrode-belt-is-easy-to-get-on-an-off-Polar-Wear Link-Nike-Set-M-XXL-92043571-Heart