The monitor works with your body heat and moisture and may require you to wet the area a little to get it activated. The monitor has an associated transmitter that works with most heart rate monitor watches (including Polar watches) and sports equipment like treadmills, elliptical trainers and stationary bikes. The bra itself is made from a combination quick drying nylon and Lycra which work together to provide comfort and sweat management.
Numetrex is a company that is dedicated to bringing products to market that fuse textiles and electronics in a useful way, especially focused on the integration for exercise and healthy living.