DESC: The principles of heart rate monitor technology are based on reading the body's electric current. To ensure a proper heart rate display, heart rate monitor manufacturers stress the importance of wet electrodes which is why most HRM users lick or spit on their transmitters. Yeah spit! It works for some, not for most. SPIT SUCKS! Of course once you begin exercising your sweat is supposed to keep your monitor functioning properly, but what if you're doing a low intensity workout and not sweating, or your sweat doesn't conduct electricity. How about in the winter when your skin is really dry? Or you go from a swim workout to a bike or run-chlorine saps your skin dry. Bottom line, if you want to ensure your monitor works all the time in any situation you have to use buh-bump heart rate monitor electrode cream.Buy two bottles and save on shipping.