Compatible with all Polar heart rate sensors, this highly comfortable belt has soft textile material, slip-preventing silicone dots and an easy-to-use buckle. Does not include the transmitter. Over time, the belt will get contaminated with material from your skin and its performance will suffer. Just get a new belt, clip on your old transmitter and you're ready to go! - New: includes interference-preventing electrodes - Grip-enhancing silicone print - Improved buckle keeps the buckle and belt perfectly lined up - XS: 58 - 71 cm - M: 67 - 91 cm - XXXL: 82 - 140 cm