The Polar Soft strap (Newest Design) is the most comfortable chest strap for heart rate measurement. The smart fusion of soft fabrics and adaptive electrodes make it extremely sensitive to your heart’s electrical signals, so the heart rate sensor can pick up your heart rate quicker and more accurately.
Compatible With the following Transmitters
Polar Nike +
Product Reviews for Polar Replacement Soft Strap for Wearlink/Bluetooth/W.I.N.D. Transmitters