A sodium-acetate solution and a small metal disc enclosed in a pouch of flexible PVC —the user flexes the disc, and the pouch releases instant heat (54°C).The technology is simple.The substance inside the pouch, which has a freezing

point of 54°C, maintains its liquid state thanks to super­cooling. Clicking the disc sets off a chain reaction (involving a crystallization process visible to the naked eye) that causes the temperature of the solution to rise to the freezing Thermo-Pad for a few minutes in boiling water, the user can repeat the process hundreds of times.The product is ideal for medical applications, as well as for outdoor activities and promotional goods.