Heart Rate Monitor Grey Coros Precision is essential—the ratio must

Precision is essential—the ratio must be accurate for the hydrogel technology to function properly

Spend a whole day of engaged conversation and musical feasts in total contoured comfort

Mix the content of each sachet with 500ml of water and shake well until dissolved

The 4:1 sodium-potassium ratio is specifically designed for situations where standard hydration products don't provide adequate sodium replacement

An elastic waistband with a drawcord lets you find your perfect fit

Heart Rate Monitor Grey Coros Precision is essential—the ratio mustCompatible with any Bluetooth heart rate enabled device, the COROS Heart Rate Monitor delivers over 38 hours of continuous accurate heart rate monitoring to track your workouts in distraction free comfort. Comfortable and simpler to wear than a chest strap. Easy to adjust the fit and remove the sensor for quick cleaning. Our latest multi channel optical sensor for precise measurement. Up to 3 simultaneous connections with Bluetooth enabled devices.